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Mixed Minerals

Sunday, 21 February 2021 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including columbite-(fe), corundum, creedite, dolomite, enstatite, and fluorapatite and more from places like Etta mine, Pennington Co., South Dakota, United States, Five Points, York Co., South Carolina, United States, Navidad mine, Abasolo, Rodeo, Durango, Mexico, Oberdorf, Styria, Austria, Summit Rock, Klamath Co., Oregon, United States, and Tory Hill, Concession 10, Lot 9, Monmouth Twp., Haliburton Co., Ontario, Canada.

Columbite-(Fe)

#55187
Locality
Etta mine, Pennington Co., South Dakota, United States 
Formula
Fe2+Nb2O6 
Availability
Sold
Size
8 x 5.5 x 5.5 cm - Sm Cabinet 
Tagged
pegmatite mineral  

Tabular, dull black crystal to nearly 3cm embedded and exposed from Albite matrix.

The Etta mine is one of the more famous mines in the Black Hills. In 1883 tin-ore (cassiterite) was discovered in the Black Hills, and the Etta mine was front and center. Suddenly everything that was black became a tin ore, such as this Columbite. Even Schorl, the black tourmaline became tin-ore. An influx of millions of dollars were invested in the so-called tin mines of the Black Hills. It became a scam and eventually exposed as one of the biggest swindels in mining history.


Columbite-(Fe)

Formula
Fe2+Nb2O6 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Granular, Striated 
Cleavage
Distinct, None, None 
Luster
Sub Metallic 
Color
black, brownish black 
Streak
blackish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Sub Conchoidal 
Hardness

Corundum

#AH53137
Locality
Five Points, York Co., South Carolina, United States 
Formula
Al2O3 
Availability
Sold
Size
8 x 6 x 4 cm - Sm Cabinet 

Thick bluish grey or black platy Corundum crystals to 3cm in a mass of waterworn or float nodule with mica.

This locality is not on Mindat and the only reference I found is on page 66 of a 1901 USGS report, Bulletin 180, "The occurence and distribution of corundum in the US." Apparently they mined this area. It is also mentioned in Bulletin 269 (1906).

This locality is about 12 miles northeast of York and 25 miles southwest
of Charlotte, N. C.



Corundum

Formula
Al2O3 
Crystal System
Trigonal 
Crystal Habit
Euhedral Crystals, Tabular, Prismatic 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
blue, red, yellow, brown, gray 
Streak
none 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Tough 
Hardness
Collection
Arnold G Hampson Collection
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Mindat
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Creedite

#44428
Locality
Navidad mine, Abasolo, Rodeo, Durango, Mexico 
Formula
Ca3Al2(SO4)(OH)2F8·2H2
Availability
Sold
Size
14 x 8 x 7 cm - Cabinet 

Large specimen with groups of excellent Creedite crystals. The largest is 1.3cm.


Creedite

Formula
Ca3Al2(SO4)(OH)2F8·2H2
Crystal System
Monoclinic 
Crystal Habit
Granular, Radial, Prismatic 
Cleavage
Perfect, None, None 
Luster
Vitreous - Greasy 
Color
colorless, violet, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Conchoidal 
Hardness
3.5 
Mineralpedia
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Mindat
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Dolomite

with Calcite - #WR55190
Locality
Oberdorf, Styria, Austria 
Formula
CaMg(CO3)2 
Availability
Sold
Size
10 x 8 x 4 cm - Cabinet 
Tagged
carbonate  

White lustrous, saddle-shaped crystals to 5mm with a large 2cm Calcite crystal. Comes with a Scott Williams label as seen in the prov. tab.


Dolomite

Formula
CaMg(CO3)2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Massive, Blocky - Rhombohedral 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
white, gray, reddish white, brownish white, gray 
Streak
white 
Class
Trigonal - Rhombohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5-4 
Collection
Willard L. Roberts Collection
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Mindat
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Enstatite

Ferrosilite series (hypersthene) - #WR55153
Locality
Summit Rock, Klamath Co., Oregon, United States 
Formula
MgSiO3 
Availability
Sold
Size
5.5 x 4 x 3.5 cm - Sm Cabinet 

Brownish well-formed crystals to 1mm.


Enstatite

Formula
MgSiO3 
Crystal System
Orthorhombic 
Crystal Habit
Massive - Fibrous, Lamellar 
Cleavage
Distinct, Distinct, None 
Luster
Vitreous - Pearly 
Color
white, yellowish green, brown, greenish white, gray 
Streak
gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle 
Hardness
5.5 
Collection
Willard L. Roberts Collection

Fluorapatite

#WR55186
Locality
Tory Hill, Concession 10, Lot 9, Monmouth Twp., Haliburton Co., Ontario, Canada 
Formula
Ca5(PO4)3
Availability
Sold
Size
9 x 3.5 x 3.5 cm - Sm Cabinet 
Tagged
phosphate  

Large hexagonal crystal of Fluorapatite with interesting colors with a resorbed termination on one end and rough termination on the other. There may be some radioactivity with this specimen. The label, seen in the prov tab provides specific locality information. This was a label made by Bill Roberts, and he always typed the label in red when there was radiation detected.


Fluorapatite

Formula
Ca5(PO4)3
Crystal System
Hexagonal 
Crystal Habit
Massive - Granular, Euhedral Crystals 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Resinous 
Color
blue, brown, colorless, violet, green 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Willard L. Roberts Collection

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