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Pegmatite Minerals

Friday, 31 October 2014 06:00 PM

Pegmatites are located all over the world and have have produced not only ore minerals but scientifically important rare mineral species. We will take a look at these minerals, mostly rare species, as well as introduce you to the many complexities of these interesting geological deposits.

Clinobisvanite

#PD40501
Locality
Londonderry Lithium deposit, Western Australia, Australia 
Formula
BiVO4 
Availability
Sold
Size
5 x 4 x 3 cm - Miniature 

Two large Bismuth crystal 2-3mm with halos of Clinobisvanite.


Clinobisvanite

Formula
BiVO4 
Crystal System
Monoclinic 
Color
yellow, orange 
Class
Monoclinic - Prismatic 
Hardness
Collection
Phillips Collection
SOLD
Collinsite - PD40477
Collinsite - PD40477

Collinsite

on Dolomite - #PD40477
Locality
Iron mine, Kovdor Massif, Kola Peninsula, Russia 
Formula
Ca2Mg(PO4)2·2H2
Availability
Sold
Size
3.5 x 3 x 1.5 cm - Miniature 
Tagged
phosphate , pegmatite mineral  

Collinsite is typically a pegmatite mineral. This locality is vague of course and refers to a large alkaline ultra basic massif of the Kola Peninsula.  The Collinsite here is a compact off-white aggregate.


Collinsite

Formula
Ca2Mg(PO4)2·2H2
Crystal System
Triclinic 
Cleavage
Perfect, Perfect, None 
Luster
Silky 
Color
colorless, white, light brown 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
3-3.5 
Collection
Phillips Collection

Cookeite

with Elbaite tourmaline - #PD31880
Locality
Portland, Middlesex Co., Connecticut, United States 
Formula
(Al,Li)3Al2(Si,Al)4O10(OH)8 
Availability
Sold
Size
8 x 6 x 6 cm - Sm Cabinet 
Tagged
pegmatite mineral  

A large mass of pegmatitic nature with light green Elbaite, purple Lepidolite, Microcline and Cookeite (light brown). Cookeite is a chlorite group member with lithium and is typically found as a late stage alteration product probably by hydrothermal activity within granitic lithium-rich pegmatites.


Cookeite

Formula
(Al,Li)3Al2(Si,Al)4O10(OH)8 
Crystal System
Monoclinic 
Crystal Habit
Micaceous, Pseudo Hexagonal 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white, green, brown, yellowish white, pinkish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Flexible 
Hardness
2.5 
Collection
Phillips Collection
On Dakota Matrix
Previously Sold Cookeite
On Dakota Matrix
Other Available Cookeite
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Correianevesite

with Hureaulite - #BM40512
Locality
Jocão pegmatite, Conselheiro Pena, Doce valley, Minas Gerais, Brazil 
Formula
Fe2+Mn2+2(PO4)2 3H2O 
Availability
Sold
Size
2.5 x 2 x 1.5 cm - Thumbnail 
Tagged
phosphate , pegmatite mineral  
Special Info
Type Locality 

Brown bipyramidal crystals to 1mm with Hureaulite. These were previously described as Reddingite. Correianevesite was described in 2013 as an intermediate member of the Reddingite-Phosphoferrite group.


Correianevesite

Collection
McConlogue Collection
Special Info
Type Locality

Diopside

with Andradite - #27853
Locality
Commercial quarry, Crestmore, Riverside Co., California, United States 
Formula
CaMgSi2O6 
Availability
Sold
Size
7 x 4 x 3 cm - Sm Cabinet 
Tagged
pegmatite mineral  

There are pegmatites at this large skarn deposit of metamorphosed limestones. Pegmatites occur as veins. In this specimen occurs green elongated blades of Diopsite and Andradite in Feldspar matrix.


Diopside

Formula
CaMgSi2O6 
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Blocky, Granular 
Cleavage
Good, Indistinct, None 
Luster
Vitreous (Glassy) 
Color
blue, brown, colorless, green, gray 
Streak
white green 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
Mineralpedia
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On Dakota Matrix
Previously Sold Diopside
On Dakota Matrix
Other Available Diopside
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Mindat
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Earlshannonite

with Jahnsite - #PD40414
Locality
Foote mine, Cleveland Co., North Carolina, United States 
Formula
Mn2+Fe3+2(PO4)2(OH)2·4H2
Availability
Sold
Size
2.5 x 1.5 x 1 cm - Thumbnail 
Tagged
phosphate , pegmatite mineral  
Special Info
Type Locality 

Brown spheroidal crystal clusters to 1mm with flattened radial clusters of brown Jahnsite. It is an excellent rich specimen. The Foote mine was huge lithium producer and is classified as a granitic pegmatite, but it is not zoned.


Earlshannonite

Formula
Mn2+Fe3+2(PO4)2(OH)2·4H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Radial, Spherical 
Cleavage
Good, Good, None 
Luster
Vitreous (Glassy) 
Color
yellow, reddish brown 
Streak
light brown 
Class
Monoclinic - Prismatic 
Fracture
Even 
Hardness
3-4 
Collection
Phillips Collection
Special Info
Type Locality

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