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M5142505) Microcline (Manebach twin) -
Mount Shavano Area, Chaffee Co., Colorado, USA Size: 11.2 x 6.5 x 6.4 cm (cabinet) Price: sold | |
| ex. Don Belsher | |
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A large 11.2 x 6.5 x 6.4 cm grouping of white opaque microcline crystals. The main ones show "manebach twinning" and measure to 3.5 cm in size. Very clean of damage. Nice cabinet sized example for showing this type of twinning from the locality. Ex Don Belsher collection. |
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S9508210) Sulphur with Aragonite -
Caltanissetta Province, Sicily, Italy Size: 8.1 x 8.1 x 6.8 cm (small-cabinet) Price: sold | |
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A highly unique and neat specimen for this Sicilian classic! The specimen consists of a colorless grouping of pseuo-hexagonal twinned crystals of aragonite, the top terminated and hosting several translucent sharply formed yellow crystals of native sulphur to 4.1 cm in size. One very minor and tiny rub is present on a sulphur crystal edge. Overall though I think this in outstanding condition for what it is. Measures 8.1 x 8.1 x 6.8 cm in size overall. A very fine and choice combination piece! |
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F9500110) Fluorite with Pyrite -
Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China Size: 5 x 2.5 x 6.7 cm (miniature) Price: $850 | |
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While there have been a large number of excellent fluorites recently available from this locality, good twinned crystals have been quite rare. This example shows an excellent spinel-law twin crystal of fluorite, flattened and exhibiting the twinning plane very well, forming a matrix-less cluster with minor brassy crystallized pyrite. Shows nicely all of the way around and measures 5 x 2.5 x 6.7 cm in size. There are two tiny chips present along one crystal edge at the upper front of the piece; outside of this the piece is very clean and sharp, free of damage, all of the way around. The color is a very pale lilac and the crystals are for the most part transparent. Very fine and choice - different and interesting! Ref: Rocks & Minerals 80(1), 46-57. |
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F2605902) Fluorite -
Big Peggy Pocket, Lake George, Park Co., Colorado, USA Size: 3 x 2.7 x 3 cm (miniature) Price: sold | |
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Neat bluish-gray translucent semi-lustrous cubic penetration twin fluorite crystals on very little matrix. Minor chipping is present as seen in the photos. Nice example for twinned fluorites from Colorado's Front Range pegmatites! |
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C2605231) Calcite -
Fengjiashan Mine (Daye Copper mine), Edong Mining District, Daye Co., Huangshi Prefecture, Hubei Province, China Size: 4.8 x 4 x 4.6 cm (miniature) Price: sold | |
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A choice loose twinned gray to colorless translucent calcite crystal grouping. Complete all around and clean of damage. Nice example for twinning in calcite! Ref: The Mineralogical Record, 38, 33-42. |
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C6766002) Cerussite -
Broken Hill, Yancowinna Co., New South Wales, Australia Size: 6.5 x 3 x 6.3 cm (miniature) Price: sold | |
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A superbly crystallized large miniature specimen for the species at this famous locality! The specimen consists of twinned colorless somewhat lustrous terminated crystals of cerussite measuring to 4 cm in length set aesthetically upon a limonitic matrix. The crystals are free standing all of the way around the matrix and are undamaged. The arrangement is great; the quality is excellent. Measures 6.5 x 3 x 6.3 cm in size overall. Ref: Worner, H. K. and Mitchell, R. W., eds. (1982): The minerals of Broken Hill. Australasian Mining and Smelting Limited, Melbourne. |
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F9509176) Fluorite (Spinel Twin) with Pyrite -
Yaogangxian Mine, Yizhang Co., Chenzhou Prefecture, Hunan Province, China Size: 3.6 x 4.1 x 3.7 cm (miniature) Price: $200 | |
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Neat flattened gemmy pale purple to colorless glassy spinel-law twin fluorite crystals to 27 mm across are set nicely on a 3.6 x 4.1 x 3.7 cm crystallized brassy micro pyrite matrix. Sits nicely for display. To my naked eye this is very clean of damage; with a 10x loupe I can find one tiny chip present on one of the fluorite crystal edges. Overall very clean and quite nice. This type of twinning in fluorite is quite unusual for the locality. This is a good one. Ref: Rocks & Minerals 80(1), 46-57. |
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C3206138) Calcite -
Mine No. 884, Leiping, Guiyang Co., Chenzhou Prefecture, Hunan Province, China Size: 6.0 x 5.0 x 2.7 cm (miniature) Price: $2500 | |
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A beautiful choice superb glassy reddish-brown to colorless glassy transparent twinned calcite crystal measuring 4.0 x 2.4 x 1.8 cm in size is set perfectly upon a calcite crystal coated matrix. There are several other smaller twins present as well. The left termination on the main crystal is just very slightly "rubbed" as seen in the photos; outside of this the specimen is perfect. Very showy, this is from the important finds at this mine in the late 1990's. Measures 6.0 x 5.0 x 2.7 cm in size overall and the main crystal is complete all around 360 degrees. Ref: Liu, Fine Minerals of China, pp 186-195. |
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G3164109) Galena -
Gidurska Mine, Erma Reka, Zlatograd, Smolyan Oblast, Bulgaria Size: 4.2 x 3.6 x 2.7 cm (miniature) Price: sold | |
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Superb sharply formed mirror-bright twinned crystals of galena to 2.5 cm in size are covering a 4.2 x 3.6 x 2.7 cm matrix. Damage free - the quality is excellent! |
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C9501255) Calcite with Stilbite -
Basalt Quarry, Ambariomiambana, Sambava District, Sava Region, Antsiranana Province, Madagascar Size: 6.2 x 5.4 x 4.7 cm (small-cabinet) Price: sold | |
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A very neat and attractive grouping of twinned yellow translucent sharply formed calcite crystals measuring to 4.7 cm in size forming a 6.2 x 5.4 x 4.7 cm cluster without matrix. There are white stilbite crystals to 2.2 cm in length present as well. Very clean and free of damage, even on the bottom where at first there appears to be two cleavage faces, these are actually natural and undamaged as well. |
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C1029819) Cassiterite with Muscovite -
Beryl-Scheelite deposit, Huya village, Mt Xuebaoding, Pingwu Co., Mianyang Prefecture, Sichuan Province, China Size: 3.6 x 3.5 x 3.1 cm (miniature) Price: sold | |
| ex. Dawn and Jim Minette | |
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A superb lustrous black sharply formed twinned crystal grouping of cassiterite measuring to 3.5 cm in size are set nicely upon a crystallized muscovite matrix. Shows nicely all around and is very clean and free of damage. The quality is excellent. Size: 3.6 x 3.5 x 3.1 cm. Ex Dawn and Jim Minette collection. Ref: The Mineralogical Record 36(1), 45-57. |
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C9501254) Calcite with Laumontite -
Basalt Quarry, Ambariomiambana, Sambava District, Sava Region, Antsiranana Province, Madagascar Size: 5.8 x 5.1 x 3.7 cm (miniature) Price: $250 | |
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Very choice pale yellow lustrous gemmy transparent neatly twinned crystals of calcite to 4.1 cm in size are set attractively upon a 5.8 x 5.1 x 3.7 cm matrix. Minor white laumontite in association. Very clean and free of damage. |
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B6302004) Bournonite with Sphalerite -
Silver King Mine, Park City District, Wasatch Mts., Summit Co., Utah, USA Size: 5.4 x 4.3 x 2.4 cm (miniature) Price: sold | |
| ex. Peter Gillis | |
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A choice old-time specimen with metallic silver gray crystals of bournonite to 0.7 cm in size scattered richly over a sphalerite crystal coated matrix measuring 5.4 x 4.3 x 2.4 cm in size. The sphalerite crystals are brownish in color and show translucency. The bournonite crystals exhibit the typical cog-wheel twinning. Very clean and free of damage. Ex Peter Gillis collection. |
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G3206134) Galena with Chalcopyrite -
Nikolaevskiy Mine, Nikolaevskoe Pb-Zn-Ag deposit, Dal'negorsk, Primorskiy Kray, Far-Eastern Region, Russia Size: 12.7 x 8.6 x 4.0 cm (cabinet) Price: $900 | |
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A neat cabinet sized combination sulfide specimen, this showing a large etched dark brassy chalcopyrite crystal measuring 6.0 cm in height, this hosting a brilliant mirror-bright lustrous spinel-law twin grouping of galena measuring to 5.7 x 4.0 x 1.8 cm in size. Clean and free of damage; complete all around 360 degrees. Size: 12.7 x 8.6 x 4.0 cm. Ref: The Mineralogical Record (2001): 32: 3; World of Stones 4/94. |
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G9900119) Galena -
Rodna, Bistrița-Năsăud Co., Romania Size: 7.5 x 6.4 x 3.4 cm (small-cabinet) Price: $425 | |
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A 7.5 x 6.4 x 3.4 cm grouping of inter-connected lead-gray semi-lustrous flattened twinned galena crystals measuring to 3.2 cm in size. No damage. I can find no information at all about this locality. There are numerous old labels with the specimen dating the piece to pre-1910. Ex Gene Tribbey collection #119. |
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