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Mixed Minerals

Friday, 06 March 2020 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including bismuthinite, galena, quartz, scheelite, and terlinguacreekite and more from places like South Crofty mine, Camborne, Cornwall, England, Fall Hill Quarry, Ashover, Derbyshire, England, Florence mine, Egremont, Cumbria, England, Carrock mine, Caldbeck Fells, Cumbria, England, and Mariposa mine, Terlingua dist., Brewster Co., Texas, United States.

Bismuthinite

with Fluorite - #52447
Locality
South Crofty mine, Camborne, Cornwall, England 
Formula
Bi2S3 
Availability
Available
Price
$150.00
Size
6.5 x 3 x 5 cm - Sm Cabinet 
Tagged
sulfide  

3-4mm long needles of Bismuthite with purple Fluorite cubes to 5mm.


Bismuthinite

Formula
Bi2S3 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Massive - Lamellar, Granular 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
gray, silver white, tin white 
Streak
gray 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Sectile 
Hardness

Galena

with Fluorite & Quartz - #52472
Locality
Fall Hill Quarry, Ashover, Derbyshire, England 
Formula
PbS 
Availability
Available
Price
$50.00
Size
9 x 6 x 5.5 cm - Sm Cabinet 
Tagged
sulfide  

A vein of Galena. The specimen demonstrates classic vein filling of Quartz and a metal crystallizing from outer to the inward direction.


Galena

Formula
PbS 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals, Massive - Granular, Massive 
Cleavage
Perfect, Perfect, Perfect 
Luster
Metallic 
Color
light lead gray, dark lead gray 
Streak
grayish black 
Class
Isometric - Hexoctahedral 
Fracture
Brittle 
Hardness
2.5 
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Quartz

var. eisenkiesel on Hematite - #52448
Locality
Florence mine, Egremont, Cumbria, England 
Formula
SiO2 
Availability
Available
Price
$65.00
Size
5 x 3 x 4 cm - Miniature 

Red doubly terminated crystals of Quartz to 3mm on Hematite matrix. 


Quartz

Formula
SiO2 
Crystal System
Trigonal 
Crystal Habit
Crystalline - Coarse, Druse, Crystalline - Fine 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
brown, colorless, violet, gray, yellow 
Streak
white 
Class
Trigonal - Trapezohedral 
Fracture
Conchoidal 
Hardness
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Scheelite

with Wolframite - #52450
Locality
Carrock mine, Caldbeck Fells, Cumbria, England 
Formula
CaWO4 
Availability
Available
Price
$55.00
Size
7.5 x 7 x 6 cm - Sm Cabinet 
Special Info
Fluorescent 

There's not much Scheelite in this specimen, but you can see a creamy large grain to 6mm. It is associated with Wolfromite which form large blades over 3cm in the Quartz matrix.


Scheelite

Formula
CaWO4 
Crystal System
Tetragonal 
Crystal Habit
Massive - Granular, Disseminated, Columnar 
Cleavage
Distinct, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, pale yellow, brownish yellow, reddish yellow 
Streak
white 
Class
Tetragonal - Dipyramidal 
Fracture
Uneven 
Hardness
4-5 
Special Info
Fluorescent
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Terlinguacreekite

#52562
Locality
Mariposa mine, Terlingua dist., Brewster Co., Texas, United States 
Formula
Hg2+3O2Cl2 
Availability
Available
Price
$750.00
Size
2.5 x 2 x 1.3 cm - Thumbnail 
Special Info
Type Locality 
Special Info
Raman 

Yes, it is indeed a spectacular specimen of Terlinguacreekite. The individual crystals are less than 0.2mm but the groups occupy much of the Calcite matrix. The mineral was found only at two localities, the Mariposa is the type locality. This is an analyzed specimen.


Terlinguacreekite

Formula
Hg2+3O2Cl2 
Crystal System
Orthorhombic 
Crystal Habit
Encrustations 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
dark orange, reddish orange 
Streak
yellow 
Class
Orthorhombic 
Fracture
Brittle - Uneven 
Hardness
2-3 
Special Info
Type Locality
Special Info
Raman

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