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Mixed Minerals

Sunday, 02 October 2022 07:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including bityite, cerussite, enstatite, ettringite, fluorapophyllite-(k), and gold and more from places like Harding mine, Taos Co., New Mexico, United States, Alta mine, Ophir dist., San Miguel Co., Colorado, United States, Gore Mountain mine, Johnsburg, Warren Co., New York, United States, Hatrurim Formation, Middle East, Långban, Filipstad, Värmland, Sweden, and Harvard mine, Jamestown, Tuolumne Co., California, United States.

Bityite

#44009
Locality
Harding mine, Taos Co., New Mexico, United States 
Formula
CaLiAl2(Si2BeAl)O10(OH)2 
Availability
Available
Price
$40.00
Size
4.5 x 3.5 x 2 cm - Miniature 
Tagged
beryllium , pegmatite mineral  

Bityite is a rather rare mica group member with lithium and beryllium in the structure. The Bityite forms colorless plates to 2mm within biotite.


Bityite

Formula
CaLiAl2(Si2BeAl)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Encrustations, Platy, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
brown white, colorless, yellow, pearl white 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
5.5 
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Cerussite

with Azurite - #AH59212
Locality
Alta mine, Ophir dist., San Miguel Co., Colorado, United States 
Formula
PbCO3 
Availability
Available
Price
$75.00
Size
7 x 4 x 4 cm - Sm Cabinet 
Tagged
carbonate  

White, prismatic crystals of Cerussite to 4mm scattered on blue Azurite and sometimes green Malachite. It is a nice colorful specimen.


Cerussite

Formula
PbCO3 
Crystal System
Orthorhombic 
Crystal Habit
Reticulate, Massive - Granular, Crystalline - Coarse 
Cleavage
Distinct, Distinct, None 
Luster
Adamantine 
Color
colorless, white, gray, blue, green 
Streak
white 
Class
Orthorhombic - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3-3.5 
Collection
Arnold G Hampson Collection
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Enstatite

with Almandine - #AH59210
Locality
Gore Mountain mine, Johnsburg, Warren Co., New York, United States 
Formula
MgSiO3 
Availability
Available
Price
$45.00
Size
7 x 5 x 5.5 cm - Sm Cabinet 

Without detailed chemical analysis, I really can't say this falls on the Enstatite end of the series Enstatite-Ferosilite. It's probably somewhere in-between but towards the Enstatite  end. Pure Enstatite is at the Magnesium end, while Ferosilite falls at the Iron end. The large green crystal grains in the matrix are the "Enstatite". The red is the Almandine.


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
Bill Wilson Collection
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Ettringite

with Hashemite(?) - #59259
Locality
Hatrurim Formation, Middle East 
Formula
Ca6Al2(SO4)3(OH)12·26H2
Availability
Available
Price
$115.00
Size
2 x 1.5 x 0.6 cm - Thumbnail 

The Cureton label this specimen came with identified this as the rare barium chromate, Hashemite. I am not sure about that identification, so a labeled it just Ettringite, which are the radial white spheroids. In the center of a few of these opened spheroids are a yellow mineral which is just to tiny for me to have confidence as Hashemite.


Ettringite

Formula
Ca6Al2(SO4)3(OH)12·26H2
Crystal System
Hexagonal 
Crystal Habit
Acicular 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white 
Streak
white 
Class
Hexagonal - Dihexagonal Dipyramidal 
Hardness
2-2.5 
Collection
Don Phillips Collection

Fluorapophyllite-(K)

#59255
Locality
Långban, Filipstad, Värmland, Sweden 
Formula
KCa4Si8O20F·8H2
Availability
Available
Price
$25.00
Size
2 x 2 x 1.5 cm - Thumbnail 

Pink platy crystals. The group is 1.3cm.


Fluorapophyllite-(K)

Gold

#58806
Locality
Harvard mine, Jamestown, Tuolumne Co., California, United States 
Formula
Au 
Availability
Available
Price
$325.00
Size
4 x 2.5 x 1.5 cm - Miniature 
Tagged
native element  

This is a very attractive specimen with Gold leaves to 1cm in milky Quartz.


Gold

Formula
Au 
Crystal System
Isometric 
Crystal Habit
Arborescent, Platy, Granular 
Cleavage
None, None, None 
Luster
Metallic 
Color
yellow, pale yellow, orange, yellow white, reddish white 
Streak
yellow 
Class
Isometric - Hexoctahedral 
Fracture
Hackly 
Hardness
2.5-3 
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