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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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 Posted: Sep 02, 2017 09:50 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Fluorite |
| Locality: | | Okorusu Mine, Otjiwarongo District, Otjozondjupa Region, Namibia |  |
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| Dimensions: | 5.6 x 7.6 cm |
| Description: |
| Intergrown groups of cubic green fluorite crystals to 1.5 cm. with purple cores. |
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9874 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 04, 2017 13:27 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Chalcopyrite on dolomite |
| Locality: | | Picher Field, Tri-State District, Ottawa County, Oklahoma, USA | |
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| Dimensions: | 3.5 x 6.1 cm |
| Description: |
| Sharp sphenoidal crystals of iridescent chalcopyrite and curved crystals of pink dolomite on a small bit of chert matrix. |
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9788 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 05, 2017 13:32 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Mottramite |
| Locality: | | Ojuela Mine, level 35, Mapimí, Municipio Mapimí, Durango, Mexico | |
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| Dimensions: | 4.4 x 6.0 cm |
| Description: |
| Velvety-textured olive green mottramite forming cauliflower-like aggregates. |
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9691 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 06, 2017 12:45 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Prehnite pseudomorph after Anhydrite |
| Locality: | | Lane Quarry, Westfield, Hampden County, Massachusetts, USA | |
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| Dimensions: | 3.3 x 5.1 cm |
| Description: |
| A stout stalactite of mint green prehnite pseudomorphing anhydrite. A rectangular hole is visible on the bottom of the specimen which once contained the anhydrite. |
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9627 Time(s) |
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vic rzonca
Joined: 18 Nov 2008
Posts: 805
Location: MA
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| Posted: Sep 06, 2017 14:33 Post subject: Re: Collection of Michael Shaw |
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| That prehnite is a beauty Mike, and a really nice image. So little comes out of that location. That may have been found in the past couple years, I managed to collect a few almost identical to yours. Nice to see a fine specimen, from my backyard, presented the way you have done so. Thanks.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 06, 2017 14:53 Post subject: Re: Collection of Michael Shaw |
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| vic rzonca wrote: | | That prehnite is a beauty Mike, and a really nice image. So little comes out of that location. That may have been found in the past couple years, I managed to collect a few almost identical to yours. Nice to see a fine specimen, from my backyard, presented the way you have done so. Thanks. |
Thanks Vic. Having grown up in Massachusetts, I collected at many localities throughout the state, but I never managed to get in to the Lane Quarry while we lived there.
Michael
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Jamison Brizendine
Joined: 27 Feb 2014
Posts: 128
Location: Northeast Ohio
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| Posted: Sep 06, 2017 15:12 Post subject: Re: Collection of Michael Shaw |
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Speaking of the Lane Quarry, I found a reference to it in a Rock and Gem article by Bob Jones.
"The best-known Massachusetts quarry is the Lane Quarry in Westfield. Decades ago, it was accessible and produced wonderful datolites reaching three inches in diameter, some of the largest ever found in this country. The Lane Quarry is also well known for babingtonite, a black mineral that frequently occurs as microscopic to 1-inch crystals in some basalt quarries. It has lately been found in India associated with zeolites.
Unfortunately, Westfield has been off limits for decades. Controls there have been so tight that even when I asked the President of Lane Construction Company over for dinner one night, I was refused admission! (Jones, 2003, p. 76)"
Well got to give credit to Bob for trying, but it makes for a good story. I agree with Vic, this is an outstanding prehnite.
References Cited:
Jones, B., 2007, The Frugal Collector: The Zeolites, Part II: Natrolite, Mesolite, Scolecite and More, Rock and Gem, v. 37 (7), p. 72-74, 76-78.
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 06, 2017 16:09 Post subject: Re: Collection of Michael Shaw |
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| Jamison Brizendine wrote: | Speaking of the Lane Quarry, I found a reference to it in a Rock and Gem article by Bob Jones.
"The best-known Massachusetts quarry is the Lane Quarry in Westfield. Decades ago, it was accessible and produced wonderful datolites reaching three inches in diameter, some of the largest ever found in this country. The Lane Quarry is also well known for babingtonite, a black mineral that frequently occurs as microscopic to 1-inch crystals in some basalt quarries. It has lately been found in India associated with zeolites.
Unfortunately, Westfield has been off limits for decades. Controls there have been so tight that even when I asked the President of Lane Construction Company over for dinner one night, I was refused admission! (Jones, 2003, p. 76)"
Well got to give credit to Bob for trying, but it makes for a good story. I agree with Vic, this is an outstanding prehnite.
References Cited:
Jones, B., 2007, The Frugal Collector: The Zeolites, Part II: Natrolite, Mesolite, Scolecite and More, Rock and Gem, v. 37 (7), p. 72-74, 76-78. |
Thanks Jamison. I enjoyed reading about Bob Jones' experiences attempting to gain access. Babingtonites from this locality are well-known and I am lucky to have a nice one from there. The 3 inch datolites, however, have eluded me thus far :>)
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 20, 2017 13:47 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Topaz |
| Locality: | | Agnus Dei Claim, Cameron Cone, Crystal Park, El Paso County, Colorado, USA | |
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| Dimensions: | 2.7 x 3.3 cm |
| Description: |
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9428 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 21, 2017 15:27 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Andradite-Grossular series |
| Locality: | | Huanggang Mines, Hexigten Banner (Kèshíkèténg Qí), Ulanhad (Chifeng), Inner Mongolia Autonomous Region, China | |
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| Dimensions: | 3.5 x 5.1 cm |
| Description: |
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| Viewed: |
9360 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 23, 2017 12:23 Post subject: Re: Collection of Michael Shaw |
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Did I happen to mention that galena is my favorite mineral :>)
| Mineral: | Galena |
| Locality: | | Ojuela Mine, Mapimí, Municipio Mapimí, Durango, Mexico | |
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| Dimensions: | 3.5 x 3.5 cm |
| Description: |
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| Viewed: |
9262 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 24, 2017 17:54 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Scolecite |
| Locality: | | Chandanapuri, Samgamner, Ahmadnagar District, Maharashtra, India | |
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| Dimensions: | 3.6 x 4.7 cm |
| Description: |
| Bright orange radiating scolecite surrounded by botryoidal colorless chalcedony. |
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| Viewed: |
9196 Time(s) |
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Tobi
Joined: 07 Apr 2009
Posts: 3352
Location: Good Old Germany
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| Posted: Sep 25, 2017 11:38 Post subject: Re: Collection of Michael Shaw |
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| crosstimber wrote: | | Did I happen to mention that galena is my favorite mineral :>) |
Yes, several times, but I don't mind ;-)
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 25, 2017 14:46 Post subject: Re: Collection of Michael Shaw |
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I knew you wouldn't mind Tobi ... I'll have a few new ones to post later in the week. However, just in case some people get tired of looking at heavy gray minerals, today's offering is fluorite.
| Mineral: | Fluorite |
| Locality: | | Tule Mine, Melchor Múzquiz, Municipio Melchor Múzquiz, Coahuila (Coahuila de Zaragoza), Mexico | |
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| Dimensions: | 4.3 x 6.5 x 8.4 cm. |
| Description: |
| Cubic fluorite with complex stepped growth and pale purple color zoning at the crystal edges. |
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| Viewed: |
9110 Time(s) |
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Sep 26, 2017 09:32 Post subject: Re: Collection of Michael Shaw |
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Hi Michael. The chalcedony (Scolecite 0219.jpg); is it not possibly hyalite opal?
_________________
Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 26, 2017 13:19 Post subject: Re: Collection of Michael Shaw |
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| Pierre Joubert wrote: | | Hi Michael. The chalcedony (Scolecite 0219.jpg); is it not possibly hyalite opal? |
Hi Pierre,
Superficially they do look a lot like hyalite, but the hardness points to chalcedony. The lack of strong green fluorescence that often accompanies hyalite is also clue. Mindat lists only scolecite, chalcedony, and stilbite from this location.
Michael
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 26, 2017 13:30 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Heterosite |
| Locality: | | White Elephant Mine, Cicero Peak, Pringle, Custer District, Custer County, South Dakota, USA | |
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| Dimensions: | 4.8 x 6.6 cm |
| Description: |
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| Viewed: |
8959 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 27, 2017 16:00 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Calcite |
| Locality: | | Joplin Field, Tri-State District, Jasper County, Missouri, USA | |
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| Dimensions: | 4.2 x 5.5 x 5.6 cm |
| Description: |
| Scalenohedral calcite crystals resting on a bit of chert matrix with pink dolomite. Many Tri-State calcites have been acid dipped to improve their luster. This one escaped that treatment and the surface features are still visible. |
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| Viewed: |
8821 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 1565
Location: Oklahoma
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| Posted: Sep 28, 2017 16:38 Post subject: Re: Collection of Michael Shaw |
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| Mineral: | Pyrite |
| Locality: | | C. E. Duff & Son Quarry, Huntsville, Logan County, Ohio, USA | |
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| Dimensions: | 3.0 x 4.6 x 6.2 cm |
| Description: |
| Bright pyrite crystals to 0.5 cm nestled in a shallow cavity in gray dolostone. Small remnants of white calcite, which was etched to expose the pyrite, are present. The crystals exhibit the uncommon diploid habit. |
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| Viewed: |
8719 Time(s) |
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| Mineral: | Pyrite |
| Locality: | | C. E. Duff & Son Quarry, Huntsville, Logan County, Ohio, USA | |
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| Dimensions: | 3.0 x 4.6 x 6.2 cm |
| Description: |
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| Viewed: |
8717 Time(s) |
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Bob Harman
Joined: 06 Nov 2015
Posts: 698
Location: Indiana
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| Posted: Sep 28, 2017 17:57 Post subject: Re: Collection of Michael Shaw |
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MICHAEL, Nice example. I have several similar pyrite specimens from Duff's Quarry. I too etched some calcite from one of them.
Is there any specific reason your example still has a small remaining area of obviously acid etched calcite? Why not carefully etch it away with some vinegar?
Regards, BOB
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