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Mixed Minerals

Sunday, 09 May 2021 05:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including macfallite, mendipite, miserite, natanite, proustite, and pyroxmangite and more from places like Manganese mine, Copper Harbor, Keweenaw Co., Michigan, Torr Works quarry, Cranmore, Somerset, England, Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States, 10th level, Potosi mine, Santa Eulalia, Chihuahua, Mexico, Měděnec, Erzgebirge, Bohemia, Czech Republic, and Sunnyside mine, Silverton, San Juan Co., Colorado, United States.

Macfallite

with Braunite - #PD55643
Locality
Manganese mine, Copper Harbor, Keweenaw Co., Michigan 
Formula
Ca2Mn3+3(SiO4)(Si2O7)(OH)3 
Availability
Sold
Size
3.5 x 4 x 3 cm - Miniature 
Special Info
Type Locality 

Dark rusty red crystals in radiating gropus of 6mm. Rare.


Macfallite

Formula
Ca2Mn3+3(SiO4)(Si2O7)(OH)3 
Crystal System
Monoclinic 
Crystal Habit
Acicular, Aggregates, Twinning Common 
Cleavage
Perfect, None, None 
Luster
Vitreous - Silky 
Color
brown, maroon, reddish brown, pink 
Streak
brown 
Class
Monoclinic - Prismatic 
Hardness
5-5.5 
Special Info
Type Locality

Mendipite

with Paralaurionite - #55720
Locality
Torr Works quarry, Cranmore, Somerset, England 
Formula
Pb3O2Cl2 
Availability
Sold
Size
1.5 x 1 x 0.6 cm - Thumbnail 

Pink Mendipite with honey yellow zones of Paralaurionite.


Mendipite

Formula
Pb3O2Cl2 
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Columnar, Radial 
Cleavage
Distinct, Distinct, None 
Luster
Adamantine - Pearly 
Color
colorless, white, gray, yellowish, bluish 
Streak
white 
Class
Orthorhombic - Disphenoidal 
Fracture
Conchoidal - Uneven 
Hardness
2.5-3 
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Miserite

with Wollastonite - #PD55714
Locality
Union Carbide mine, Wilson Springs, Garland Co., Arkansas, United States 
Formula
KCa6Si8O22(OH) 
Availability
Sold
Size
6 x 3 x 1 cm - Sm Cabinet 

Ping compact fibrous crystals with white, splintery crystals of Wollastonite. The black is probably Aegerine.


Miserite

Formula
KCa6Si8O22(OH) 
Crystal System
Triclinic 
Cleavage
Perfect, Indistinct, None 
Luster
Vitreous - Pearly 
Color
lilac pink, pink, reddish brown 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
5.5-6 
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Natanite

on Ilvaite - #51629
Locality
10th level, Potosi mine, Santa Eulalia, Chihuahua, Mexico 
Formula
Fe2+Sn4+(OH)6 
Availability
Sold
Size
3.5 x 1 x 1.5 cm - Miniature 
Tagged
tin  

There are about 13 crystals of Natanite on the Ilvaite. The best is about 0.5mm. Natanite is a rare tin mineral.


Natanite

Formula
Fe2+Sn4+(OH)6 
Crystal System
Isometric 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
greenish brown 
Class
Isometric - Hexoctahedral 
Hardness
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Proustite

on Arsenic - #RW55678
Locality
Měděnec, Erzgebirge, Bohemia, Czech Republic 
Formula
Ag3AsS3 
Availability
Sold
Size
5.5 x 5 x 3 cm - Sm Cabinet 
Tagged
sulfide , silver  

Cherry red Proustite crystals to 1mm with dull Arsenic.


Proustite

Formula
Ag3AsS3 
Crystal System
Trigonal 
Crystal Habit
Massive, Crystalline - Poor, Blocky 
Cleavage
None, None, None 
Luster
Sub Metallic 
Color
vermilion, reddish gray 
Streak
vermilion red 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Sectile 
Hardness
2-2.5 
Collection
Robert J. Waidler Collection
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Pyroxmangite

#AH53964
Locality
Sunnyside mine, Silverton, San Juan Co., Colorado, United States 
Formula
Mn2+SiO3 
Availability
Sold
Size
4.5 x 4 x 1.5 cm - Miniature 

Pink massive Pyroxmangite with disseminated sulfides.


Pyroxmangite

Formula
Mn2+SiO3 
Crystal System
Triclinic 
Crystal Habit
Massive, Massive - Granular 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous - Pearly 
Color
pink, rose pink, purplish pink, yellowish red brown, brown 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
5.5-6 
Collection
Arnold G Hampson Collection

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