Mineral Specimen and Product Inventory Search
- Availability
- Sold
- Locality
- Springfield, Oregon, United States
- Formula
- Na2(Si3Al2)O10·2H2O
- Size
- 5.5 x 6 x 2 cm - Sm Cabinet
Snow white radiating crystals to 5mm.
- Availability
- Sold
- Locality
- 3M quarry, Little Rock, Pulaski Co., Arkansas, United States
- Formula
- Na2(Si3Al2)O10·2H2O
- Size
- 18 x 8 x 8 cm - Cabinet
Excellent and colorless crystals of Natrolite crystals to to 8mm with scattered Aegerine needles to 7mm. Very cool specimen.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Bear Meadow Adit, Quartz Hill deposit, Ketchikan district, Alaska, United States
- Formula
- NiAs
- Size
- 11.5 x 6 x 3 cm - Cabinet
- Tagged
- Ore Minerals
All of the Cobalt specimens in this update probably originated from a study conducted in the 1960's. The results were summarized in the landmark publication "The Silver - Arsenides Deposits of the Cobalt-Gowganda Region, Ontario" edited by L. G. Berry with major contributions by W. Petruk and J. L. Jambor. On page 108, Petruk describes the five assemblages of mineralization at Cobalt. This specimen clearly fits into group #1, the Nickel-Arsenide assemblage characterized by complex botryoidal masses of Nickeline inter-growths with Breithauptite, Safflorite and Cobaltite. The minerals form concentric layers and it would be impossible to differentiate visually all the minerals without a thorough microprobe study. Looking closely at the ore, one can see the plumose-texture characteristic of all of these ore specimens. It is sawed flat and polished on one side.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Cobalt-Gowganda dist., Ontario, Canada
- Formula
- NiAs
- Size
- 9 x 7 x 2 cm - Sm Cabinet
- Tagged
- Ore Minerals
Classic nickel arsenide assemblage as described by Petruk in "The Silver-Arsenide Deposits of Cobalt...", This specimen shows the plumose ore texture so typical of Cobalt but mostly composed of brassy colored Breithauptite and Nickeline with a distinct rose hue. This assemblage was found most prevalent in at the ends, tops and bottoms of most veins. Excellent specimen showing also the Dolomitic gangue. It is sawed flat on one side and shows natural breakage on the other.
- Availability
- Sold
- Featured
- Featured in Special Editions
- Locality
- Hi-Ho Silver mine, Cobalt dist., Ontario, Canada
- Formula
- NiAs
- Size
- 6.5 x 4 x 1 cm - Sm Cabinet
The Cobalt district is located within the Superior structural province of the Canadian Shield. Two distinct suites of minerals and age of mineralization occur throughout the region. The older are base metal sulfides associated with Archean volcanics and are classified as stratiform and syngenetic. The younger are the ore suites consisting of silver-cobalt-nickel-arsenic assemblages hosted within Archean volcanics and Huronian rocks and are fissure fillings and replacement veins. It was found through detailed research of ore samples that five typical assemblages of arsenides occur in specific parts of the ore veins at Cobalt. This specimen belongs to group 2, the Ni-Co-As assemblage, which typically contains a high Silver content and a predominance of nickel and cobalt arsenides. These assemblages were defined by William Petruk in the 1960's and published in "The Silver-Arsenide Deposits of the Cobalt-Gowganda Region, Ontario" (MAC). This specimen contains abundant Nickeline and Safflorite. It is a sawed and polished on one side which shows well the rosettes and veinlets of the ore minerals.
- Availability
- Sold
- Locality
- Mina Rey y Reina, Charcas, San Luis Potosi, Mexico
- Formula
- Ca3[BO(OH)2]6·2H2O
- Size
- 7 x 5 x 5 cm - Sm Cabinet
Excellent 1 to 2cm waterclear crystals of Nifontovite. Most are terminated.
