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Bob's rocks
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Michael Shaw
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PostPosted: Mar 23, 2015 10:01    Post subject: Re: Bob's rocks  

A really superb copper, Bob.
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GneissWare




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PostPosted: Mar 23, 2015 20:19    Post subject: Bob's rocks - a couple of USA classics  

...


KW02.jpg
 Mineral: Malachite
 Locality:
Apex Mine, Jarvis Peak, Beaver Dam Mountains, Tutsagubet District, Washington County, Utah, USA
 Dimensions: 72 x 40 x 18 mm
 Description:
Classic old specimen of shiny botryoidal Malachite. An old label states it was found in 1943.
 Viewed:  29501 Time(s)

KW02.jpg



KW03a.jpg
 Mineral: Hübnerite on Quartz with Pyrite
 Locality:
Sweet Home Mine, Mount Bross, Alma District, Park County, Colorado, USA
 Dimensions: 38 x 30 x 16 mm
 Description:
Sharp blades of lustrous black Hubnerite to 22 x 6 mm sit atop clear needle Quartz pounts to 15 x 2 mm. Several brassy Pyrite crystals to 7 mm are nestled amongst the Quartz. This is a fairly rich specimen of Hubnerite for the Sweet Home Mine, and the crystals display some flashes of red. Hubnerites were pretty rare at the Sweet Home.
 Viewed:  29465 Time(s)

KW03a.jpg



KW03b.jpg
 Mineral: Hübnerite on Quartz with Pyrite
 Locality:
Sweet Home Mine, Mount Bross, Alma District, Park County, Colorado, USA
 Dimensions: 38 x 30 x 16 mm
 Description:
another view
 Viewed:  29493 Time(s)

KW03b.jpg


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am mizunaka




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PostPosted: Mar 23, 2015 21:25    Post subject: Re: Bob's rocks  

Very cool malachite piece ...
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GneissWare




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PostPosted: Mar 23, 2015 21:29    Post subject: Re: Bob's rocks  

Thanks Mike!
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PostPosted: Mar 24, 2015 22:39    Post subject: Bob's rocks - a Fluorite and a Stibnite  

...


KW88.jpg
 Mineral: Fluorite with Quartz
 Locality:
Orange river pegmatites, Kakamas, ZF Mgcawu District, Northern Cape Province, South Africa
 Dimensions: 108 x 100 x 76 mm
 Description:
Several Green Fluorites with octahedral modifications are spectacularly arranged on a matrix of pale Amethystine Quartz. The largest Fluorite crystals is 45 x 43 x 37 mm, and some are accented by a Quartz druse. This is reputedly the finest Orange River Fluorite specimen from the Key Collection. A very aesthetic specimen.
 Viewed:  29413 Time(s)

KW88.jpg



MR477.jpg
 Mineral: Stibnite with Marcasite
 Locality:
Socavón Mine (La Salvadora mine), Oruro city, Cercado Province, Oruro Department, Bolivia
 Dimensions: 120 x 118 x 56 mm
 Description:
A spray of Stibnite blades to 114 mm long are accented by a yellowish crust of Marcasite on the reverse. Collected in 1977 according to the Richard A. Kosnar's label. and purchased by Dr. M. Rausch in 1987. In excellent condition.
 Viewed:  29348 Time(s)

MR477.jpg


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James Catmur
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PostPosted: Mar 25, 2015 04:11    Post subject: Re: Bob's rocks  

I like the form of the Orange river fluorite - form always excites me (so I have to book on fluorite crystal forms)
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GneissWare




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PostPosted: Mar 25, 2015 17:50    Post subject: Re: Bob's rocks  

James wrote:
I like the form of the Orange river fluorite - form always excites me (so I have to book on fluorite crystal forms)

That was what grabbed me about the specimen. They are almost dodecahedrons.
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PostPosted: Mar 29, 2015 11:11    Post subject: Bob's rocks - Copper/Prehnite  

...


GW000460.JPG
 Mineral: Copper on Prehnite
 Locality:
Adventure Mine, Greenland, Greenland Township, Ontonagon County, Michigan, USA
 Dimensions: 66 x 40 x 39 mm
 Description:
Lustrous, lime-green Prehnite crystals to 2 mm cover a basalt matrix. Copper as thin wires and small leafs are perched on and intergrown with Prehnite. Specimens of Copper and Prehnite are not common, and this is a fine example. No damage.
 Viewed:  29034 Time(s)

GW000460.JPG


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PostPosted: May 11, 2015 21:42    Post subject: Bob's rocks - Australia oddities  

A few from the land down under...


RG1430a.jpg
 Mineral: Topaz in Kaolinite
 Locality:
Dolcoath Hill Quarry, Moina District, Tasmania, Australia
 Dimensions: 82 x 61 x 38 mm
 Description:
Many, sharp, gemmy pale-green Topaz crystals to 11 mm are exposed in a kaolinite matrix. No damage.
 Viewed:  28711 Time(s)

RG1430a.jpg



RG1430b.jpg
 Mineral: Topaz in Kaolinite
 Locality:
Dolcoath Hill Quarry, Moina District, Tasmania, Australia
 Dimensions: 82 x 61 x 38 mm
 Description:
closeup
 Viewed:  28683 Time(s)

RG1430b.jpg



RG1432a.jpg
 Mineral: Beryl
 Locality:
Annamurra Creek area, Mount Riddock Station, Harts Range, Central Desert Region, Northern Territory, Australia
 Dimensions: 112 x 108 x 106 mm
 Description:
Pale-blue Beryl crystal measuring 112 x 108 x 106 mm, with medium to matte luster. Although not a gemmy crystal, specimens of this size are rarely seen today, and this is a very large beryl for the Northern Territory. It has likely been out of the ground for a long time. It is in excellent condition.
 Viewed:  28722 Time(s)

RG1432a.jpg


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PostPosted: May 15, 2015 10:25    Post subject: Bob's rocks - San Diego Co. pegmatites  

Here are a few rarities... A huge Cryo-Genie Morganite and a rare, unrepaired matrix Himalaya specimen.


RG1431.jpg
 Mineral: Beryl ( variety morganite ) with Elbaite on Albite (variety cleavelandite)
 Locality:
Cryo-Genie Mine, Warner Springs, Warner Springs District, San Diego County, California, USA
 Dimensions: 121 x 91 x 70 mm
 Description:
A large, lustrous, peach-colored Beryl (var. Morganite), measuring 88 x 63 x 38 mm, is perched on a matrix of lustrous blades of white Albite (var. Cleavlandite) and recrystallized clear Quartz. Lustrous crystals of Elbaite to 10 x 2 mm, in both pink and green color, richly cover the Cleavlandite. It has great clarity and can be seen through completely. There is a very good repair, which is common for these pieces. This is a huge Morganite for the County, and exceptional and rare for the Cryo-Genie, in excellent condition.
 Viewed:  28533 Time(s)

RG1431.jpg



RG1425a.jpg
 Mineral: Elbaite with Beryl (variety morganite) and Mica (variety lepidolite) on Albite (variety cleavelandite)
 Locality:
Himalaya Mine, Gem Hill, Mesa Grande District, San Diego County, California, USA
 Dimensions: 175 x 93 x 85 mm
 Description:
This large cabinet specimen of Elbaite is dominated by a large buff-colored Orthoclase crystal measuring 90 x 75 x 60 mm which anchors many blades of snow-white Albite (var. Cleavlandite) to 30 mm across. Nestled within the Albite are four large Elbaites, the largest measuring 51 x 30 x 19 mm, in varying shades of green and pink, complemented with a book of pale purple Lepidolite to 21 mm across. A sharp, pale-pink 24 x 15 mm Beryl (var. Morganite), a rarity from the Himalya Mine, is also nested in the Albite. Several clear Quartz points to 25 x 9 mm are also present. Matrix specimen from the Himalaya Mine are not common, and this is a large and historic specimen (ex. Gary Hansen, c. 1967-1970 specimen; ex. James W. Simpson collection) in great condition.
 Viewed:  28492 Time(s)

RG1425a.jpg



RG1425b.jpg
 Mineral: Elbaite with Beryl (variety morganite) and Mica (variety lepidolite) on Albite (variety cleavelandite)
 Locality:
Himalaya Mine, Gem Hill, Mesa Grande District, San Diego County, California, USA
 Dimensions: 175 x 93 x 85 mm
 Description:
closeup of Elbaite
 Viewed:  28517 Time(s)

RG1425b.jpg



RG1425c.jpg
 Mineral: Elbaite with Beryl (variety morganite) and Mica (variety lepidolite) on Albite (variety cleavelandite)
 Locality:
Himalaya Mine, Gem Hill, Mesa Grande District, San Diego County, California, USA
 Dimensions: 175 x 93 x 85 mm
 Description:
closeup of Elbaite
 Viewed:  28495 Time(s)

RG1425c.jpg



RG1425d.jpg
 Mineral: Elbaite with Beryl (variety morganite) and Mica (variety lepidolite) on Albite (variety cleavelandite)
 Locality:
Himalaya Mine, Gem Hill, Mesa Grande District, San Diego County, California, USA
 Dimensions: 175 x 93 x 85 mm
 Description:
closeup of Beryl (v. Morganite)
 Viewed:  28490 Time(s)

RG1425d.jpg



RG1425e.jpg
 Mineral: Elbaite with Beryl (variety morganite) and Mica (variety lepidolite) on Albite (variety cleavelandite)
 Locality:
Himalaya Mine, Gem Hill, Mesa Grande District, San Diego County, California, USA
 Dimensions: 175 x 93 x 85 mm
 Description:
closeup of Elbaite
 Viewed:  28563 Time(s)

RG1425e.jpg


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Carles Millan
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PostPosted: May 15, 2015 15:02    Post subject: Re: Bob's rocks - San Diego Co. pegmatites  

GneissWare wrote:
Here are a few rarities... A huge Cryo-Genie Morganite and a rare, unrepaired matrix Himalaya specimen.

Hi, Bob!

Very interesting your Himalaya mine specimen. As you state, for having a matrix, its large dimensions, and the presence of beryl, not common in that deposit. However, as you no doubt are aware of, the name morganite should not be used in the Mineral lines, since one can only write IMA species there. Would you mind me correcting it for you?

_____
Fixed
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PostPosted: Jun 19, 2015 11:59    Post subject: Bob's rocks - Grossular "Lake Jaco"  

For flashback Friday, this is one that got away -- I had to sell it to pay for the mining project ...


0035298001325569946.jpg
 Mineral: Grossular
 Locality:
Sierra de las Cruces, Sierra Mojada mining district, Municipio Sierra Mojada, Coahuila (Coahuila de Zaragoza), Mexico
 Dimensions: 20 cm
 Description:
The specimen is approximately 20 cm across, and the largest Grossular crystal is about 7 cm long. The matrix is a mixture of fine grained clear to whitish garnets and what is likely wollastonite. This specimen was collected by Graham Sutton and Bob Griffis in December 1993 from an isolated hill (Cerro de Moka) at the south end of the Sierra de Cruces mountain range. The garnet-bearing outcrop was at the top of the hill and was completely removed over 2 field trips. After spending about 80 hours using an air scribe to carefully expose the garnets from their enclosing matrix, the specimen was sold to Dennis Beals who did more work on it. He then sold it to the Freiburg Museum, where it is now in the Pohl collection. Someday, I would like to see it again!

Photo is a scan of a pre-digital print, so excuse the quality, and note that it represents the specimen prior to Dennis performing additional preparation work.
 Viewed:  28087 Time(s)

0035298001325569946.jpg


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PostPosted: Jun 25, 2015 22:26    Post subject: Bob's rocks - Garnet from Coyote front  

Michael, here is one I had photo'd before. They often are this color in some of the larger pieces, and not quite so clean as yours--not surprising given the skarn origin. Some are also found with Epidote.

I know I have a few others I'll try to get to soon.



GW001267.JPG
 Mineral: Grossular
 Locality:
Coyote Range, Bishop, Bishop District, Inyo County, California, USA
 Dimensions: 67 x 65 x 62 mm
 Description:
This fine specimen has several cinnamon colored, gemmy, lustrous Grossular crystals, the largest measuring 60 x 48 x 43 mm in size. Unlike most garnets from this locality, these are freestanding and complete Grossular crystals. One of the smaller crystals has a ding, but the large crystal is intact.
 Viewed:  27935 Time(s)

GW001267.JPG


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PostPosted: Jul 03, 2015 12:03    Post subject: Bob's rocks - Chalcocite from Cornwall, England  

...


GW001208.JPG
 Mineral: Chalcocite
 Locality:
Camborne - Redruth - Saint Day District, Cornwall, England / United Kingdom
 Dimensions: 57 x 45 x 42 mm
 Description:
This historic specimen consists of iridescent, intergrown flattened crystals of Chalcocite to 17 mm across on a small piece of tan matrix, accented with 8 mm Quartz points. It is former British Museum and Royal Geol. Soc. of Cornwall collection (1957). No damage.
 Viewed:  27755 Time(s)

GW001208.JPG


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PostPosted: Aug 04, 2015 21:02    Post subject: Bob's rocks - Ferberite / Fluorite China  

...


IMG_1728.jpg
 Mineral: Ferberite with Fluorite
 Locality:
Yaogangxian Mine, Yizhang, Chenzhou Prefecture, Hunan Province, China
 Dimensions: 84 x 75 x 55 mm
 Description:
The largest Ferberite is 60 mm long
 Viewed:  27388 Time(s)

IMG_1728.jpg



IMG_1729.jpg
 Mineral: Ferberite with Fluorite
 Locality:
Yaogangxian Mine, Yizhang, Chenzhou Prefecture, Hunan Province, China
 Dimensions: 84 x 75 x 55 mm
 Description:
 Viewed:  27382 Time(s)

IMG_1729.jpg



IMG_1731.jpg
 Mineral: Ferberite with Fluorite
 Locality:
Yaogangxian Mine, Yizhang, Chenzhou Prefecture, Hunan Province, China
 Dimensions: 84 x 75 x 55 mm
 Description:
 Viewed:  27369 Time(s)

IMG_1731.jpg


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PostPosted: Aug 04, 2015 21:11    Post subject: Bob's rocks - More from China  

...


IMG_1735.jpg
 Mineral: Wulfenite
 Locality:
Jianshan Mine, Ruoqiang, Bayin'gholin Autonomous Prefecture, Xinjiang Uyghur Autonomous Region, China
 Dimensions: 103 x 68 mm
 Description:
From 2015
 Viewed:  27355 Time(s)

IMG_1735.jpg



IMG_1737.jpg
 Mineral: Wulfenite
 Locality:
Jianshan Mine, Ruoqiang, Bayin'gholin Autonomous Prefecture, Xinjiang Uyghur Autonomous Region, China
 Dimensions: 103 x 68 mm
 Description:
12 mm crystals
 Viewed:  27355 Time(s)

IMG_1737.jpg



IMG_1742.jpg
 Mineral: Fluorite on Quartz
 Locality:
Huanggang Mines, Hexigten Banner (Kèshíkèténg Qí), Chifeng (Ulanhad), Inner Mongolia Autonomous Region, China
 Dimensions: 77 x 70 x 60
 Description:
Largest Fluorite is 24 x 20 mm
 Viewed:  27342 Time(s)

IMG_1742.jpg



IMG_1739.jpg
 Mineral: Olshanskyite with Andradite, Wurtzite and Galena
 Locality:
Shijiangshan Mine, Yinwu, Linxi, Ulanhad League, Inner Mongolia Autonomous Region, China
 Dimensions: 103 x 100 x 57 mm
 Description:
Largest Olshanskyite is 20 x 4 mm
 Viewed:  27364 Time(s)

IMG_1739.jpg



IMG_1741.jpg
 Mineral: Olshanskyite with Andradite, Wurtzite and Galena
 Locality:
Shijiangshan Mine, Yinwu, Linxi, Ulanhad League, Inner Mongolia Autonomous Region, China
 Dimensions: 103 x 100 x 57 mm
 Description:
 Viewed:  27347 Time(s)

IMG_1741.jpg


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Pierre Joubert




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PostPosted: Aug 05, 2015 01:54    Post subject: Re: Bob's rocks  

Stunning wulfenite.
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PostPosted: Aug 08, 2015 07:09    Post subject: Re: Bob's rocks  

Pierre Joubert wrote:
Stunning wulfenite.
I agree - never seen such a thrilling superb piece of wulfenite from China!
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PostPosted: Jan 31, 2016 17:12    Post subject: Bob's rocks - Sweet Home Mine, Colorado  

Here is a piece...not great, but special to me as I was able to collect it from inside the mine.


RG1464a.JPG
 Mineral: Fluorite on Quartz with Pyrite
 Locality:
Sweet Home Mine, Mount Bross, Alma District, Park County, Colorado, USA
 Dimensions: 157 x 112 x 56 mm
 Description:
Light purple cubes of lustrous, transparent Fluorite to 12 mm cover a matrix of white needles of Quartz to 17 mm long with brassy Pyrites to 17 mm and less crystallized black sulfides. One portion of the specimen is in excellent condition, and it should be trimmed, but as is it is more geologically interesting. The back side is fully covered with fine needle Quartz and accented with black sulfides and brassy Pyrites. I self collected this on September 9, 2001 in the main haulage tunnel.
 Viewed:  25770 Time(s)

RG1464a.JPG



RG1464b.JPG
 Mineral: Fluorite on Quartz with Pyrite
 Locality:
Sweet Home Mine, Mount Bross, Alma District, Park County, Colorado, USA
 Dimensions: 157 x 112 x 56 mm
 Description:
Close up
 Viewed:  25778 Time(s)

RG1464b.JPG


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PostPosted: Jan 31, 2016 23:20    Post subject: Bob's rocks - Laumontite from California  

...


IMG_4213L.jpg
 Mineral: Laumontite with Calcite
 Locality:
Pine Creek Mine, Scheelite, Bishop District (Tungsten Hills District), Inyo County, California, USA
 Dimensions: 112 x 102 x 77 mm
 Description:
Slender, well-formed, twinned, prismatic Laumontite crystals to 70 mm long form a slightly diverging cluster. The terminations are classic fish-tail twins. Yellow Calcite crystals accent the Laumontite crystals. These specimens have been well preserved and looks like they may survive in spite of the mineral being so unstable. This is an excellent specimen from this long ago closed tungsten mine.
 Viewed:  25718 Time(s)

IMG_4213L.jpg


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