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Roger Warin
Joined: 23 Jan 2013
Posts: 961
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 Posted: Jul 13, 2013 15:13 Post subject: Re: Collection of Michael Shaw |
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Many thanks, Michael.
Roger.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 15, 2013 09:08 Post subject: Re: Collection of Michael Shaw |
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A few specimens in my collection from Argentina.
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Rhodochrosite
Capillitas Mine, Andalgalá Department, Catamarca, Argentina
0.6 x 8.0 cm
Polished section through a rhodochrosite stalactite with concentric bands surrounding a bright pink center core. |
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27181 Time(s) |
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Hematite
Payún volcano, Altiplano de Payún Matru, Malargüe Department, Mendoza, Argentina
2.6 x 5.8 cm.
Elongated octahedral hematite pseudomorphing magnetite and showing skeletal herringbone ribs. Collected from a fumarole in 2001. |
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27174 Time(s) |
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Chalcedony var. agate
Chubut Province, Argentina
6.5 x 7.2 cm.
Colorful, polished section of "condor" agate with strong fortification bands on the outer edge and colorless crystalline quartz in the center. |
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27190 Time(s) |
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Fluorite
El Gaudro Mine, Talampaya, La Rioja, Argentina
6.2 x 7.1 cm.
Multiple, intergrown, pale green fluorite octahedrons with frosted faces on a quartz matrix. |
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27191 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 17, 2013 08:43 Post subject: Re: Collection of Michael Shaw |
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Argentina minerals.
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Natrolite
San Agustin Del Valle Fertil, San Juan Prov., Argentina
4.6 x 7.6 x 10.2 cm.
Colorless acicular crystals of natrolite to 3.5 cm with reddish-brown iron oxide inclusions. Collected in Summer 2004. |
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27131 Time(s) |
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Inyoite
Monte Azul deposit, Sijes, Salta Prov., Argentina
4.1 x 5.3 cm.
Sharply-formed colorless pseudorhombic crystals to 2.2 cm on edge with minor meyerhofferite. |
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27095 Time(s) |
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Microcline
Papachacra Mts., Belen Dept., Catamarca Prov., Argentina
3.0 x 3.3 cm.
A single cream-colored twinned microcline crystal sitting atop smaller microcline crystals. |
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27093 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 21, 2013 18:40 Post subject: Re: Collection of Michael Shaw |
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Today I will finish up South America with a few specimens from Chile.
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Brochantite
Vieja Mine, Potrerillos, Diego de Almagro, Chañaral Province, Atacama Region, Chile
5.7 x 7.0 cm.
Dark green acicular brochantite and pale blue cyanotrichite covering the top surface of brown gossan matrix. |
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27035 Time(s) |
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Atacamite
La Farola Mine, Cerro Pintado, Tierra Amarilla,, Copiapo Prov., Chile
5.0 x 7.0 cm.
Lustrous dark green needles of atacamite covering both sides of a flat piece of matrix. |
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27041 Time(s) |
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Atacamite
La Farola Mine, Cerro Pintado, Tierra Amarilla,, Copiapo Prov., Chile
1.5 x 2.5 cm.
A floater fan-shaped spray of atacamite. |
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27069 Time(s) |
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Atacamite
La Farola Mine, Cerro Pinatdo, Tierra Amarilla,, Copiapo Prov., Chile
8.0 x 12.5 cm, FOV~3.5 cm
Flat-laying radial sprays of lustrous, dark green atacamite on a thin layer of off-white halloysite with isolated spherical sprays of light olive green libethenite and blue-green pseudomalachite. |
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27021 Time(s) |
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vic rzonca
Joined: 18 Nov 2008
Posts: 777
Location: MA
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| Posted: Jul 21, 2013 21:14 Post subject: Re: Collection of Michael Shaw |
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| Great shots, Mike. Made me look back at your gallery. Nice!
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 22, 2013 08:41 Post subject: Re: Collection of Michael Shaw |
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| vic rzonca wrote: | | Great shots, Mike. Made me look back at your gallery. Nice! |
Thanks Vic. It has been many years ago, but I grew up in the Bay State, and as a young collector, went on field trips all over MA, VT, NH, ME, CT, and NY. As a result, I have been following your collection thread with great interest. I'm sure quite a few of the localities where we collected are probably closed now.
Michael
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Roger Warin
Joined: 23 Jan 2013
Posts: 961
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| Posted: Jul 22, 2013 09:52 Post subject: Re: Collection of Michael Shaw |
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Hello,
Great photos and remarkable specimens.
Never seen atacamite # TN 415.
Roger.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 22, 2013 10:10 Post subject: Re: Collection of Michael Shaw |
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As a young mineral collector, my approach to collecting was not very focused. The first "group" of minerals that I remember taking an interest in was zeolites. Although there were several trap rock quarries within a one hour drive of where we lived, they were closed to collecting. However, if you walked along the railroad tracks and searched through the ballast, you could usually find a few decent datolite, calcite, and prehnite specimens. This was my first introduction to the zeolite group and its common associates.
All of this was before U.S. collectors were exposed to the overwhelming variety and abundance of Indian zeolites. My first introduction to zeolites from India was at a small mineral show, and I remember thinking that the variety and crystallization were fantastic. I came home with a nice peach-colored stilbite from Jalgaon and an okenite from Mumbai. The vast amount of this specimen material available during the past 25 years has made it easy to become jaded. However, nearly 35 years later, I have to admit that I am still fascinated by zeolites from the Deccan basalts. So, in the next few posts I have decided to show some of the Deccan zeolites in my collection.
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Stilbite
Jalgaon, Maharashtra State, India
7.7 x 10.5 cm.
An intergrown group of peach-colored stilbite crystals on a flat basalt plate covered with gray drusy quartz. |
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26941 Time(s) |
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Gyrolite
Malad, Ward 38, Mumbai District, Maharashtra, India
7.6 x 8.3 cm.
An olive-green hemisphere of gyrolite on a thin matrix of smaller gyrolite spheres associated with blocky colorless fluorapophyllite crystals. |
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26945 Time(s) |
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Calcite
Jalgaon, Maharashtra State, India
4.9 x 5.9 cm
Interpenetrant, colorless, distorted rhombs on a small shard of chalcedony. |
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26952 Time(s) |
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Natrolite
Yeola, Nasik District, Maharashtra, India
7.3 x 9.8 cm.
Divergent sprays of transparent prismatic natrolite associated with small pseudocubic crystals of apophyllite-(KF) on brown basalt. Recovered from a well dig in Sept. 2011. |
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26999 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 22, 2013 10:18 Post subject: Re: Collection of Michael Shaw |
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| Roger Warin wrote: | Hello,
Great photos and remarkable specimens.
Never seen atacamite # TN 415.
Roger. |
Thank you Roger. According to Rock Currier, these are sometimes found free in crevices between breccia blocks. I had only seen a few photos of these on Mindat. In any case I was happy to have found this one at Tucson.
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 24, 2013 10:00 Post subject: Re: Collection of Michael Shaw |
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Continuing today with minerals from the Deccan traps.
| Description: |
Mesolite
Lonavala, Pune District, Maharashtra, India
4.5 x 11.7 cm.
Divergent sprays of colorless mesolite on a thin rind of basalt and pale pink stilbite. |
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26841 Time(s) |
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Goosecreekite
Pandulena Quarry, Nasik Dist., Maharashtra, India
5.0 x 5.8 cm.
A colorless spherical aggregate of goosecreekite sitting on pale tan stilbite with pearly white heulandite. |
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26804 Time(s) |
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Powellite
Savada, Jalgaon Dist., Maharashtra, India
5.0 x 7.0 cm.
A yellowish, pseudo-octahedral powellite crystal on white scolecite. |
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26798 Time(s) |
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Stellerite
Nasik District, Maharashtra, India
3.5 x 5.7 cm.
Two intergrown hemispheres of pearly-lustered stellerite on a small shard of dark gray basalt. |
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26840 Time(s) |
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Heulandite
Aurangabad District, Maharashtra, India
3.0 x 5.2 cm.
Floater group of heulandite crystals colored pale green by inclusions of celadonite. |
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26818 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 961
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| Posted: Jul 24, 2013 10:11 Post subject: Re: Collection of Michael Shaw |
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Hello,
I enjoyed Stellerite, in delicate shades. As well as heulandite.
Roger.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 24, 2013 14:17 Post subject: Re: Collection of Michael Shaw |
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| Roger Warin wrote: | Hello,
I enjoyed Stellerite, in delicate shades. As well as heulandite.
Roger. |
Thanks Roger. So many of the zeolites are white or colorless, it's nice when there are inclusions that impart a little color.
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 26, 2013 09:42 Post subject: Re: Collection of Michael Shaw |
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More Indian zeolites.
| Description: |
Apophyllite-(KF)
Kandivali Quarry, Malad, Ward 38, Mumbai District, Maharashtra, India
7.5 x 9.5 cm.
Colorless elongated pseudocubic crystals of apophyllite on pale green prehnite associated with snow white spheres of acicular okenite. |
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26634 Time(s) |
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| Description: |
Apophyllite-(KF)
Jalgaon District, Maharashtra, India
4.5 x 7.1 cm.
A chalcedony stalactite covered with colorless apophyllite crystals and a pinkish stilbite crystal speckled with dark green jugoldite. |
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26693 Time(s) |
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| Description: |
Scolecite
Junnar, Pune District, Maharashtra, India
4.5 x 9.4 cm.
Three intersecting sprays of slender colorless scolecite crystals. |
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26688 Time(s) |
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Heulandite
Aurangabad District, Maharashtra, India
5.7 x 8.3 cm.
A group of heulandite crystals grading from colorless to pale peach on chalky-white mordenite. |
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26629 Time(s) |
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Roger Warin
Joined: 23 Jan 2013
Posts: 961
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| Posted: Jul 26, 2013 10:12 Post subject: Re: Collection of Michael Shaw |
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Hello Michael,
As ever, perfect.
I forgot morphological distinctions (on termination) that allow differentiation of natrolite, mesolite and scolecite.
Thank you for sharing.
Roger.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 26, 2013 14:28 Post subject: Re: Collection of Michael Shaw |
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| Roger Warin wrote: | Hello Michael,
As ever, perfect.
I forgot morphological distinctions (on termination) that allow differentiation of natrolite, mesolite and scolecite.
Thank you for sharing.
Roger. |
Hi Roger,
I am not aware of any absolute way to visually distinguish between natrolite, mesolite, and scolecite. Generally speaking, mesolite forms the thinnest crystals, natrolite somewhat larger, and scolecite forms more robust crystals, but this isn't a reliable identifying characteristic. Of course natrolite and mesolite are orthorhombic, while scolecite is monoclinic. The problem is, twinning makes scolecite appear to be orthorhombic. To my knowledge, the terminations of all three minerals are typically low angle pyramids. If anyone knows a reliable way to tell these apart visually, feel free to chime in.
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 28, 2013 14:13 Post subject: Re: Collection of Michael Shaw |
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Continuing with minerals from the Deccan traps.
| Description: |
Apophyllite-(KF)
Aurangabad District, Maharashtra, India
8.5 x 15.0 cm.
Colorless crystals of apophyllite with white stilbite crystals, scattered over a thin crust of small reddish-pink heulandite crystals. |
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26527 Time(s) |
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| Description: |
Calcite
Vambori, Aurangabad District, Maharashtra, India
4.5 x 5.0 cm.
Pale green scalenohedral calcite crystal composed of multiple stacked rhombs, with small calcite rhombs around the base. Recovered during a well dig in 2005. |
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26552 Time(s) |
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Thomsonite
Soygaon, Aurangabad District, Maharashtra, India
4.5 x 7.6 cm.
A group of creamy white thomsonite spheres with reddish-brown iron oxide tinges. |
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26544 Time(s) |
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| Description: |
Stilbite
Aurangabad District, Maharashtra, India
3.2 x 8.0 cm.
A group of colorless stilbite crystals attached to a thin stalactite of salmon-colored heulandite crystals |
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26523 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 29, 2013 15:28 Post subject: Re: Collection of Michael Shaw |
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Continuing with specimens from India's Deccan traps - a quintet of stilbite.
| Description: |
Stilbite
Nasik District, Maharashtra, India
4.5 x 6.5 cm.
Cluster of bright orange stilbite which displays the typical wheat-sheave arrangement. |
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26469 Time(s) |
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Stilbite
Sakur, Ahmednagar District, Maharashtra, India
8.0 x 11.0 cm
A group of lustrous, white crystals to 5.5 cm partially colored reddish-brown by iron oxide. |
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26456 Time(s) |
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| Description: |
Stilbite
Jalgaon District, Maharashtra, India
5.7 x 6.0 cm
A large bowtie stilbite with a few smaller accessory stilbite crystals. |
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26457 Time(s) |
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| Description: |
Stilbite
Jalgaon District, Maharashtra, India
7.0 x 7.7 cm.
Pale salmon-colored stilbite crystals on stalactitic drusy blue-gray chalcedony. Collected in 2005. |
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26468 Time(s) |
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| Description: |
Stilbite
Sakur, Ahmednagar District, Maharashtra, India
4.0 x 8.1 cm.
A group of stilbite crystals included with green celadonite. |
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26506 Time(s) |
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GneissWare
Joined: 07 Mar 2008
Posts: 1284
Location: California
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| Posted: Jul 29, 2013 15:45 Post subject: Re: Collection of Michael Shaw |
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| As always, really nice photos (and specimens). Are you shooting on glass?
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Roger Warin
Joined: 23 Jan 2013
Posts: 961
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| Posted: Jul 29, 2013 16:28 Post subject: Re: Collection of Michael Shaw |
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what else to say, wow
Roger.
PS: same questions.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1485
Location: Oklahoma
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| Posted: Jul 29, 2013 17:50 Post subject: Re: Collection of Michael Shaw |
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| GneissWare wrote: | | As always, really nice photos (and specimens). Are you shooting on glass? |
Thank you Bob and Roger. Yes, the specimens rest on a a piece of glass and the backgrounds, consisting of various colored mat boards, are placed at a 45 degree angle below the glass. A single light illuminates the background and creates the gradient effect, I use 3 lights above to illuminate the specimen, and often a reflector or two to highlight crystal faces, etc. I use halogen lights with the camera white balance set to the color temperature of the bulbs. It's not a real complex setup but yields adequate results for my needs.
Michael
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