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Mixed Minerals

Friday, 28 June 2019 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including helvite, hollandite, kamenevite, labuntsovite-mn, legrandite, and leucophosphite and more from places like Iron Mountain dist., Sierra Co., New Mexico, United States, Walter Mayfield prospect, Jeff Davis Co., Texas, United Stastes, Oleniy Ruchey apatite mine, Mt. Suoluaiv, Khibiny, Kola, Russia, Mont Saint-Hilaire, Rouville Co., Quebec, Canada, Mina Ojuela, Mapimi, Durango, Mexico, and Tip Top mine, Custer Co., South Dakota, United States.

Helvite

#50984
Locality
Iron Mountain dist., Sierra Co., New Mexico, United States 
Formula
Mn2+4(BeSiO4)3
Availability
Sold
Size
3 x 2 x 2.5 cm - Thumbnail 
Tagged
beryllium  

Orange distorted micro crystals to 1mm.


Helvite

Formula
Mn4Be3(SiO4)3S 
Crystal System
Isometric 
Crystal Habit
Massive 
Cleavage
Indistinct, Indistinct, Indistinct 
Luster
Vitreous - Resinous 
Color
brown, brownish yellow, gray, yellow, yellow green 
Streak
grayish white 
Class
Isometric - Hextetrahedral 
Fracture
Brittle 
Hardness
6-6.5 
Mineralpedia
View Helvite
On Dakota Matrix
Previously Sold Helvite
On Dakota Matrix
Other Available Helvite
WebMineral
View Helvite
Mindat
View Helvite

Hollandite

#50979
Locality
Walter Mayfield prospect, Jeff Davis Co., Texas, United Stastes 
Formula
BaMn2+Mn4+7O16 
Availability
Sold
Size
6 x 4 x 3.5 cm - Sm Cabinet 

Dull black-grey mass of Hollandite.


Hollandite

Formula
BaMn2+Mn4+7O16 
Crystal System
Monoclinic 
Crystal Habit
Striated, Prismatic, Acicular 
Cleavage
Good, None, None 
Luster
Earthy (Dull) 
Color
grayish black, black, silver gray 
Streak
black 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
4-6 
SOLD
Kamenevite - 50509
Kamenevite - 50509

Kamenevite

#50509
Locality
Oleniy Ruchey apatite mine, Mt. Suoluaiv, Khibiny, Kola, Russia 
Formula
K2TiSi3O9·H2
Availability
Sold
Size
Micromount 
Special Info
XRD Confirmed 
Special Info
EDS Confirmed 
Special Info
Type & Only Locality 
Special Info
Author's Material 

Tiny, less than 1mm, grain on EDS mount. Author Igor Pekov's study specimen used for publication.


Special Info
XRD Confirmed
Special Info
EDS Confirmed
Special Info
Type & Only Locality
Special Info
Author's Material

Labuntsovite-Mn

#50987
Locality
Mont Saint-Hilaire, Rouville Co., Quebec, Canada 
Formula
Na4K4Mn2+2Ti8O4(Si4O12)4(OH)4·10-12H2
Availability
Sold
Size
1.5 x 2 x 0.4 cm - Thumbnail 

Vibrant orange prismatic crystals to 3mm. Not colorized!


Labuntsovite-Mn

Formula
Na4K4Mn2+2Ti8O4(Si4O12)4(OH)4·10-12H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic 
Cleavage
Perfect, None, None 
Luster
Greasy (Oily) 
Color
brownish yellow, pink, reddish brown 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Subconchoidal 
Hardness
SOLD
Legrandite - 50959
Legrandite - 50959

Legrandite

#50959
Locality
Mina Ojuela, Mapimi, Durango, Mexico 
Formula
Zn2AsO4(OH)·H2
Availability
Sold
Size
2 x 1 x 0.6 cm - Thumbnail 
Tagged
arsenate  

Thumbnail specimen of Legrandite with gorgeous yellow-orange color.


Legrandite

Formula
Zn2AsO4(OH)·H2
Crystal System
Monoclinic 
Crystal Habit
Crystalline - Fine, Prismatic 
Cleavage
Imperfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, yellowish orange 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
4-5 

Leucophosphite

#50992
Locality
Tip Top mine, Custer Co., South Dakota, United States 
Formula
KFe3+2(PO4)2(OH)·2H2
Availability
Sold
Size
4 x 3 x 4.5 cm - Miniature 
Tagged
phosphate , pegmatite mineral  

Color changing Leucophosphite crystals to 0.5mm. The entire vug is lined with crystals. The color is purple under incandescent lighting and green under sunlight. The digital camera really brings out the purple! 


Leucophosphite

Formula
KFe3+2(PO4)2(OH)·2H2
Crystal System
Monoclinic 
Cleavage
Indistinct, None, None 
Luster
Vitreous - Dull 
Color
brown, brownish yellow, colorless, greenish, white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
3.5 

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