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Rare & Mixed Minerals

Thursday, 16 June 2022 06:00 PM

Introducing the "Rare & Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including astrophyllite, atacamite, avogadrite, bismutotantalite, bonchevite, and calumetite and more from places like Pikes Peak, El Paso Co., Colorado, United States, Shattuck mine, Bisbee, Cochise Co., Arizona, United States, Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy, Analamisakana peg., Tsaratanana, Betsiboka, Madagascar, Naretschenski Bani, Plovdiv, Bulgaria, and Centennial mine, Houghton Co. Michigan, United States.

Astrophyllite

#58601
Locality
Pikes Peak, El Paso Co., Colorado, United States 
Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4
Availability
Sold
Size
6.5 x 7.5 x 1.5 cm - Sm Cabinet 

Rusty red to golden brown mass composed of thin mice-lke plates. Nice piece.


Astrophyllite

Formula
K2NaFe2+7Ti2(Si4O12)2O2(OH)4
Crystal System
Triclinic 
Crystal Habit
Bladed, Stellate, Crystalline - Fine 
Cleavage
Perfect, None, None 
Luster
Adamantine - Pearly 
Color
brown, brownish red, bronze yellow, gold yellow 
Streak
yellowish brown 
Class
Triclinic - Pedial 
Fracture
Brittle 
Hardness
3-3.5 
Collection
RC Stamberg Collection

Atacamite

with Malachite - #RS58617
Locality
Shattuck mine, Bisbee, Cochise Co., Arizona, United States 
Formula
Cu2Cl(OH)3 
Availability
Sold
Size
3.7 x 3.2 x 2 cm - Miniature 
Tagged
copper  

Light green Malachite with glassy primatic darker green Atacamite.


Atacamite

Formula
Cu2Cl(OH)3 
Crystal System
Orthorhombic 
Crystal Habit
Euhedral Crystals, Fibrous, Granular 
Cleavage
Perfect, None, None 
Luster
Adamantine 
Color
green, yellow, yellow green, black green 
Streak
apple green 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
3-3.5 
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SOLD
Avogadrite - RS58596
Avogadrite - RS58596

Avogadrite

#RS58596
Locality
Mt. Vesuvius, Somma Complex, Napoli, Campania, Italy 
Formula
KBF4 
Availability
Sold
Size
3.5 x 1 x 1 cm - Miniature 
Special Info
Type Locality 

Lemon yellow, earthy masses of Avogadrite in a vial. The masses are around 1cm. Avogadrite is named after Amedeo Carlo Avogadro(1776 – 1856) an Italian physicist who determined the molecular theory that the number of molecules per mole of substance is exactly 6.02214076×10^23. It is otherwise known as "Avogadro constant". It is used to this day in chemical reactions. I use it all the time when I make pizza.

Avogadrite is a three locality mineral.


Avogadrite

Formula
KBF4 
Crystal System
Orthorhombic 
Crystal Habit
Tabular 
Luster
Vitreous - Greasy 
Color
colorless, white, yellowish, reddish 
Streak
colorless 
Class
Orthorhombic - Dipyramidal 
Hardness
Collection
RC Stamberg Collection
Special Info
Type Locality

Bismutotantalite

#RS58628
Locality
Analamisakana peg., Tsaratanana, Betsiboka, Madagascar 
Formula
BiTaO4 
Availability
Sold
Size
4.5 x 3.3 x 2.5 cm - Miniature 
Tagged
pegmatite mineral  

An excellent crystal of Bismutotantalite with several faces.


Bismutotantalite

Formula
BiTaO4 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Euhedral Crystals 
Cleavage
Perfect, Distinct, None 
Luster
Adamantine - Metallic 
Color
light brown, black 
Streak
yellowish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal 
Hardness
Collection
RC Stamberg Collection

Bonchevite

#RS58632
Locality
Naretschenski Bani, Plovdiv, Bulgaria 
Formula
PbBi4S2 
Availability
Sold
Size
4.5 x 3 x 2.8 cm - Miniature 

Slender acicular crystals to 5mm long.


Collection
RC Stamberg Collection

Calumetite

#RS58605
Locality
Centennial mine, Houghton Co. Michigan, United States 
Formula
Cu(OH)2·2H2
Availability
Sold
Size
3 x 2 x 1.4 cm - Thumbnail 
Tagged
copper  
Special Info
Type Locality 

Sky blue masses of rare Calumetite with Epidote and native Copper. Rich.


Calumetite

Formula
Cu(OH)2·2H2
Crystal System
Orthorhombic 
Crystal Habit
Spherical, Wheat Sheaf, Scaly 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
azure blue, powder blue, bluish white 
Streak
blue 
Class
Orthorhombic 
Fracture
Brittle 
Hardness
Collection
RC Stamberg Collection
Special Info
Type Locality

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