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Mixed Minerals

Friday, 13 August 2021 10:00 AM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including arsenic, colemanite, goethite, malayaite, maxwellite, and metavivianite and more from places like Port Alberni, Vancouver Island, British Columbia, Canada, Death Valley, Inyo Co., California, United States, Santa Eulalia, Chihuahua, Mexico, Ash Mountain, Tuya Range, British Columbia, Canada, Squaw Creek mine, Catron Co., New Mexico, United States, and Anloua, Martap, Vina, Adamawa, Cameroon.

Arsenic

#56290
Locality
Port Alberni, Vancouver Island, British Columbia, Canada 
Formula
As 
Availability
Sold
Size
3.3 x 2.7 x 1.5 cm - Miniature 
Tagged
native element  

Mass of dark grey Arsenate.


Arsenic

Formula
As 
Crystal System
Trigonal 
Crystal Habit
Nodular, Reniform, Lamellar 
Cleavage
Perfect, None, None 
Luster
Metallic 
Color
lead gray, gray, white 
Streak
black 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Uneven 
Hardness
3.5 
Mineralpedia
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On Dakota Matrix
Previously Sold Arsenic
On Dakota Matrix
Other Available Arsenic
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Colemanite

#56291
Locality
Death Valley, Inyo Co., California, United States 
Formula
CaB3O4(OH)3·H2
Availability
Sold
Size
3.5 x 3 x 2 cm - Miniature 

Sharp, long bladed colorless Colemanite crystals to 2cm. Excellent specimen.


Colemanite

Formula
CaB3O4(OH)3·H2
Crystal System
Monoclinic 
Crystal Habit
Blocky, Crystalline - Coarse, Massive - Granular 
Cleavage
Perfect, Distinct, None 
Luster
Vitreous (Glassy) 
Color
colorless, gray, gray white, yellowish white, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4.5 

Goethite

#52659
Locality
Santa Eulalia, Chihuahua, Mexico 
Formula
FeO(OH) 
Availability
Sold
Size
7 x 6 x 4 cm - Sm Cabinet 

An interesting specimen of former selenite now replaced by black Goethite.


Goethite

Formula
FeO(OH) 
Crystal System
Orthorhombic 
Crystal Habit
Acicular, Reniform, Radial 
Cleavage
Perfect, Distinct, None 
Luster
Adamantine - Silky 
Color
brown, reddish brown, yellowish brown, brownish yellow, ocher yellow 
Streak
yellowish brown 
Class
Orthorhombic - Dipyramidal 
Fracture
Hackly 
Hardness
5-5.5 
Collection
Barbara Cureton Collection
Mineralpedia
View Goethite
On Dakota Matrix
Previously Sold Goethite
On Dakota Matrix
Other Available Goethite
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Malayaite

#52663
Locality
Ash Mountain, Tuya Range, British Columbia, Canada 
Formula
CaSnO(SiO4
Availability
Available
Price
$475.00
Size
5.5 x 4 x 3 cm - Sm Cabinet 
Tagged
tin  
Special Info
XRD Confirmed 

This is one of the best Malayites out there. Infact it was photographed in the Mineralogical Record of Feb. 1992. Malayite is the tin analogue of Titanite, and is relatively rare. The crystals are a little over 2cm and there are two of them.


Malayaite

Formula
CaSnO(SiO4
Crystal System
Monoclinic 
Crystal Habit
Wedge shaped, Massive 
Luster
Vitreous (Glassy) 
Color
colorless, greenish gray, white, light yellow, orange 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
3.5-4 
Collection
Barbara Cureton Collection
Special Info
XRD Confirmed

Maxwellite

#56306
Locality
Squaw Creek mine, Catron Co., New Mexico, United States 
Formula
NaFe3+AsO4
Availability
Sold
Size
2 x 2 x 2 cm - Thumbnail 
Special Info
Type Locality 

Tiny less than 1mm crude red crystals in Rhyolite.


Maxwellite

Formula
NaFe3+AsO4
Crystal System
Monoclinic 
Crystal Habit
Aggregates, Prismatic 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
dark red 
Streak
red orange 
Class
Monoclinic 
Hardness
5-5.5 
Special Info
Type Locality

Metavivianite

#BN56342
Locality
Anloua, Martap, Vina, Adamawa, Cameroon 
Formula
(Fe2+,Fe3+)3(PO4)2(OH)2·6H2
Availability
Available
Price
$30.00
Size
3 x 2 x 0.7 cm - Thumbnail 

It's kind of a crumbly specimen since the mineral occurs in very thin platy crystals. The color is really a dark green like the first photo. The second accidentally caught the reflections of my lights.


Metavivianite

Formula
(Fe2+,Fe3+)3(PO4)2(OH)2·6H2
Crystal System
Triclinic 
Crystal Habit
Prismatic, Striated 
Cleavage
Perfect, None, None 
Luster
Sub Metallic 
Color
leek green, gray green, reddish brown 
Streak
yellowish brown 
Class
Triclinic 
Hardness
1.5-2 
Collection
Dr. Buford Nichols Collection

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