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Michael Shaw
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Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 17, 2022 12:55 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Calcite |
Locality: | Conco Mine, North Aurora, Kane County, Illinois, USA | |
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Dimensions: | 8.0 x 7.8 x 4.0 cm |
Description: |
Grayish scalenohedral calcite crystals included with tiny marcasite crystals. Most of the crystal have sharp phantoms. |
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6451 Time(s) |
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Mineral: | Calcite |
Locality: | Conco Mine, North Aurora, Kane County, Illinois, USA | |
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Dimensions: | 8.0 x 7.8 x 4.0 cm |
Description: |
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6438 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 18, 2022 08:19 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Baryte |
Locality: | Magma Mine, Superior, Pioneer District, Pinal Mountains, Pinal County, Arizona, USA | |
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Dimensions: | 3.5 x 2.8 x 1.8 cm |
Description: |
Transparent to translucent, yellow barite crystals in an intergrown group of blocky crystals to 1.0 cm on edge. |
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6396 Time(s) |
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Tobi
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Joined: 07 Apr 2009
Posts: 4102
Location: Germany
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Posted: Nov 21, 2022 03:22 Post subject: Re: Collection of Michael Shaw |
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An excellent baryte specimen with great aesthetics, Michael!
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 21, 2022 11:36 Post subject: Re: Collection of Michael Shaw |
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Tobi wrote: | An excellent baryte specimen with great aesthetics, Michael! |
Thank you, Tobi. It's a small specimen, but as I understand it, the larger crystals tended to be included with a variety of oxides and sulfides causing them to be various shades of brown to black.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 21, 2022 11:49 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Andradite |
Locality: | Stanley Butte area, Stanley Butte, Stanley District, San Carlos Indian Reservation, Graham County, Arizona, USA | |
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Dimensions: | 2.4 x 2.1 cm |
Description: |
An intergrown group of green dodecahedral andradite crystals exhibiting slight iridescence. |
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6272 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4102
Location: Germany
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Posted: Nov 22, 2022 09:32 Post subject: Re: Collection of Michael Shaw |
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Michael Shaw wrote: | Tobi wrote: | An excellent baryte specimen with great aesthetics, Michael! | Thank you, Tobi. It's a small specimen, but as I understand it, the larger crystals tended to be included with a variety of oxides and sulfides causing them to be various shades of brown to black. | Thanks for the additional information. The crystals remind me of those from Châtel-Guyon in France, I once had a specimen from there which was very similiar to your piece from Magma Mine.
Regards
Tobi
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 22, 2022 14:39 Post subject: Re: Collection of Michael Shaw |
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Tobi,
I wasn't familiar with The French location of Chatel-Guyon, so I looked it up on Mindat and yes, the crystals are remarkably similar in color and morphology. Thanks for pointing out this new (to me) location.
Regards,
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 23, 2022 10:39 Post subject: Re: Collection of Michael Shaw |
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...
Mineral: | Quartz |
Locality: | De Baca County, New Mexico, USA | |
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Dimensions: | 1.9 x 1.6 cm |
Description: |
An opaque light brown Cumberland habit quartz crystal known locally as "Pecos Valley Diamonds." |
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6107 Time(s) |
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James Catmur
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Joined: 14 Sep 2006
Posts: 1343
Location: Cambridge
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 25, 2022 09:44 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Olivenite |
Locality: | Majuba Hill Mine, Antelope District, Pershing County, Nevada, USA | |
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Dimensions: | 5.5 x 3.2 x 2.0 cm |
Description: |
Lustrous acicular olive-green olivenite crystals on an iron-rich matrix. |
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5966 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 27, 2022 10:00 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Cinnabar with Mercury |
Locality: | Almaden Mine, Almadén, Comarca Valle de Alcudia, Ciudad Real, Castilla-La Mancha, Spain | |
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Dimensions: | 6.5 x 4.0 x 1.9 cm |
Description: |
Bright red massive cinnabar with small blebs of silvery native mercury smeared over the surface. |
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5769 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Nov 29, 2022 09:44 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Galena |
Locality: | Cadjebut Mine, Fitzroy Crossing, Derby-West Kimberley Shire, Western Australia, Australia | |
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Dimensions: | 6.5 x 4.0 x 3.2 cm |
Description: |
Galena crystals to 1.0 cm with cuboctahedral and stepped cubic growth covering the top of a sulfide matrix with minor colorless calcite crystals. |
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5650 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Dec 02, 2022 09:44 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Quartz (variety chalcedony) |
Locality: | Mopah Spring, Turtle Mountain Wilderness, San Bernardino County, California, USA | |
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Dimensions: | 5.2 x 3.9 x 2.1 cm |
Description: |
A pale pink chalcedony rose that displays green fluorescence under short wave UV. |
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5489 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Dec 04, 2022 11:02 Post subject: Re: Collection of Michael Shaw |
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I first became aware of these Newfoundland amethyst specimens at the 2020 Tucson Show. After looking through hundreds of specimens I was unable to find an undamaged piece. I'm told this was because the deposit was mined with mechanical equipment resulting in specimens with quite a lot of damage. I forgot about these until I spied a couple of flats at the 2022 Denver Show. To my surprise, most of the pieces were damage free, so I had a second chance to select a few for the collection.
Mineral: | Quartz (variety amethyst) |
Locality: | La Manche, Placentia Bay, Newfoundland (Island), Newfoundland and Labrador, Canada | |
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Dimensions: | 8.3 x 6.5 x 5.0 cm |
Description: |
Tightly intergrown amethyst crystals showing mostly just the pyramidal terminations. |
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5394 Time(s) |
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Mineral: | Quartz (variety amethyst) |
Locality: | La Manche, Placentia Bay, Newfoundland (Island), Newfoundland and Labrador, Canada | |
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Dimensions: | 6.0 x 4.5 x 4.0 cm |
Description: |
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5390 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Dec 06, 2022 12:44 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Gypsum |
Locality: | Lily Mine, Umay District, Pisco Province, Ica Department, Peru | |
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Dimensions: | 9.2 x 7.6 x 4.6 cm |
Description: |
Sharp lustrous water-clear crystals of gypsum var. selenite to 5.1 cm across forming an intergrown group. |
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5309 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Dec 08, 2022 12:45 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Siderite and Quartz |
Locality: | Trepča Complex, Trepča Valley, Kosovska Mitrovica, Kosovska Mitrovica District, Kosovo | |
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Dimensions: | 4.0 x 7.0 x 7.0 cm |
Description: |
A combination of prismatic white quartz, spherical brown siderite, and dark green chlorite. The terminations on some of the quartz crystals have unusual clear zones. |
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5175 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Dec 11, 2022 10:54 Post subject: Re: Collection of Michael Shaw |
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...
Mineral: | Copper |
Locality: | Chino Mine, Santa Rita, Santa Rita District, Grant County, New Mexico, USA | |
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Dimensions: | 4.1 x 1.2 cm |
Description: |
An elongate spinel-twinned copper crystal from the 5100 Bench, East Pit with a nice patina and darker areas of cuprite. |
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4961 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Dec 15, 2022 09:27 Post subject: Re: Collection of Michael Shaw |
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Mineral: | Gypsum |
Locality: | Naica Mine, Naica, Municipio Saucillo, Chihuahua, Mexico | |
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Dimensions: | 6.8 x 5.4 x 4.4 cm |
Description: |
Sharp water-clear gypsum crystals on a mound of golden scalenohedral calcite crystals. |
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4759 Time(s) |
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Tobi
Site Admin
Joined: 07 Apr 2009
Posts: 4102
Location: Germany
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Posted: Dec 16, 2022 03:06 Post subject: Re: Collection of Michael Shaw |
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Lovely gypsum!!!
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2066
Location: Oklahoma
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Posted: Dec 16, 2022 12:44 Post subject: Re: Collection of Michael Shaw |
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Tobi wrote: | Lovely gypsum!!! |
Thank you, Tobi. Where we live there is not a great variety of minerals to be collected, but there is no shortage of Gypsum. I have collected Gypsum specimens from 5 or 6 localities in Oklahoma, and the habits are quite distinct. Years ago, I focused somewhat on building a suite of Gypsum from around the world since it was ubiquitous and relatively inexpensive. That suite now includes 83 Gypsum specimens from 52 different localities. It was fun building that suite, and I have used it several times for various programs and displays. Occasionally, I will come across a Gypsum specimen from a locality that is not represented in the collection, and I will add another piece to the suite.
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