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Gregory Crenko  Collection
Edward David
Quartz var. Amethyst Crystal Cluster
Boekenhoutshoek Area, Mkobola, Nkangala District, Mpumalanga Province, South Africa
10.5 x 9 x 8.5 cm
Cuprian Adamite on Limonite
Level 5, Mina Ojuela, Mapimi, Durango, Mexico
5.5 x 4.5 x 4.5 cm
Ex-Betty Kalaskie Collection
Purplish Quartz var. Chalcedony (Grape Agate) 
Manakkara  Beach, Mamaju  Area, Sulawesi  Barat  Province, Sulawesi, Indonesia
9 x 6 x 3.5 cm
Fluorite with Calcite Crystals on Matrix
Xianghualing Mine, Xianghualing Sn-Polymetallic Ore Field,
Linwu County, Chenzhou Prefecture, Hunan Province, China
12.5 x 8.5 x 5.5 cm

Iridescent Chalcopyrite Crystals on Dolomite
Brushy Creek Mine, Viburnum Trend, Reynolds County, Missouri, USA
20.5 x 14.5 x 4 cm
Ex-Betty Kalaskie Collection
Stibnite Crystals on Calcite Matrix
Rosaura Mine, Chicla District, Huarochiri Province, Lima Department, Peru
7 x 7 x 6.5 cm
Calcite Crystals on Matrix
Linwood Mine, Buffalo Scott County, Iowa, USA
12 x 9 x 7.5 cm
Ex-Betty Kalaskie Collection

Hematinic Quartz with Calcite, Dolomite & Chalcopyrite
Fengjiashan Mine (Daye Copper Mine), Daye Co., Huangshi Prefecture, Hubei Province, China
13.5 x 11 x 3 cm
Calcite Crystals on Matrix
Turt Mine, Turt, Negresti-Oas, Satu Mare, Romania
11.5 x 9 x 4 cm
Calcite on Fluorite
Bethel Level,  M. F. Oxford No. 7 Mine, Ozark-Mahoning Group, Cave-in-Rock Sub-District, Illinois, Hardin County, Illinois, USA
9 x 6.5 x 5 cm
Ex-Dr. Perry & Anne Bynum Collection
Cave Calcite Crystal Cluster
Yangshuo County, Guilin City, Guangxi Province, China
13 x 7 x 6 cm
Pyrite Crystal Cluster with Quartz
Huanzala Mine, Huallanca District, Dos de Mayo Province, Huánuco Department, Peru
9 x 6 x 5.5 cm
Fluorite Crystal Cluster with Calcite
Xianghualing Mine, Xianghualing Sn-Polymetallic Ore Field,
Linwu County, Chenzhou Prefecture, Hunan Province, China
13.5 x 12.5 x 6 cm
Fluorite Crystals on Matrix
Xinyang Prefecture, Henan Province, China
15 x 13 x 6 cm
Fluorite Crystal Cluster with Calcite
Elmwood Mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith County,Tennessee, USA
10 x 6.5 x 4 cm

Azurite with Malachite
Sepon Mine, Vilabouly District, Savannakhet Province, Laos
6.5 x 6.5 x 2 cm
Iridescent Quartz Crystal Cluster (Treated with Titanium)
Source Unknown
8 x 7 x 4 cm

Metal-coated crystals are natural crystals, such as Quartz, whose surface has been coated with metal to give them an iridescent metallic sheen. Crystals treated this way are used for decorative purposes. Possible coatings include gold (resulting in a stone called aqua aura), indium, titanium, niobium and copper. While not intended for serious mineral
collectors -they are attractive and are nice gifts to those who like to decorate their desks or other display areas with a pleasing eye catcher.
Quartz Crystal Cluster
The Old Coleman Mine, Blocker Lead #4), Jessieville, Garland County, Arkansas, USA
10.5 x 10 x 9 cm
Spessartine Garnets on Orthoclase
Tongbei Area, Fujian Province, China
7.5 x 7 x 3.5 cm
Quartz var. Amethyst on Quartz Covered Matrix
Goboboseb Mountains, Brandberg Area, Erongo Region, Namibia, Africa
8 x 6 x 4.5 cm
Drusy Quartz on Chrysocolla
Mauto Tres Gracis Mine, Diego de Almagro, Chile
7.5 x 5.5 x 3.5 cm
Calcite Crystals on Sphalerite
Elmwood Mine, Carthage, Central Tennessee Ba-F-Pb-Zn District, Smith County,Tennessee, USA
17 x 13 x 9 cm
Stilbite Crystals on Chalcedony (Quartz)
Jalgaon, Maharashtra, India
16.5 x 11.5 x 7.5 cm
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Beautiful cluster of Amethyst crystals with some caramel color highlights, probably due to traces of iron.
Lustrous Cuprian adamite crystals on Limonite.
These new Chalcedonies or Grape Agates are from a new find in Indonesa and were a hot item at the recent Tuscon Mineral Show. Very attractive.
Back Side
Attractive green Fluorite crystals with Calcite. Backside of all Calcite crystals is also presentable.
Excellent large plate of bluish to purple iridescent Chalcopyrite crystals on Dolomite. Unique to the location and one of the best examples I have seen.
Nice cluster of lustrous Stibnite crystals on Calcite.
Super Calcite crystal, with some greenish tinting and well defined facets perched on substrate with smaller Calcites. In fine condition.
Aesthetic mix of Hematinic Quartz with Dolomite, Calcite and Iridescent Chalcopyrite.
Golden Fluorite crystals with purple zoning and adorned with Calcite. The location less common. In fine shape with only a natural contact seen in the photo.
Aesthetic stalactitic cave Calcite with nice luster and some brownish tinting, probably from Iron.
A fine cluster of golden Pyrite from a new find in Peru.
Stalagmatic type formation of Chalcedony with two lustrous, translucent, light orange Stilbites.
Very nice. large cluster of gemmy, golden, double terminated Calcite crystals on Sphalerite from the famous Elmwood Mine.
Green Fluorite crystals with coating of Calcite from a recent find in China.
Sparkling dark green Fluorite on matrix from a recent find in China.
Light blue Fluorite crystal cluster with minor Calcite from the famous Elmwood Mine.
Pretty Azurite with Malachite specimen from recent finds in Laos.
Excellent cluster of super glassy Quartz from the Cloemen Mine - source of the best Quartz specimens in the USA. In great condition.
Dark red Spessartine Garnets on contrasting matrix of white Orthoclase.
Super gemmy Amethyst crystal (4x1 cm) nestled in the center of this specimen with surrounding "regular" Quartz.
Glistening, light blue formation of drusy Quartz with Chrysocolla. relatively rare and good addition to any collection.
Highly unusual spiky mini-clusters of Calcite on matrix from the Turt Mine. Could not find anything like it on Mindat's photo search for the mine.
Hematinic Quartz Crystal Cluster with Hematite
Jinlong Hill, Longchuan County, Heywan Prefecture, Ghangdong Province, China
13 x 10 x 7 cm
Very nice specimen of Hematinic Quartz crystals on rosettes of Hematite. In good condition and presentable from both sides.
Opposite Side
Sale - 25 % Off List Price for the Following Specimens