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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.

SOLD
Lovdarite - PD40458
Lovdarite - PD40458

Lovdarite

#PD40458
Locality
Yubileinaya pegmatite, Karnasurt Mt., Lovozero Massif, Kola Peninsula, Russia 
Formula
K2Na6Be4Si14O36·9H2
Availability
Sold
Size
1.5 x 1 x 1 cm - Thumbnail 
Tagged
beryllium  
Special Info
Type Locality 

White fibrous crystals in a 2.5mm area. Lovdarite is a beryllium zeolite found in alkali, silica poor environments in only three worldwide localities. Yubileinaya pegmatite, by Dr. Igor Pekov's standard, is one of the greatest pegmatites in the world. In such a small deposit of 26 x 1 meters nearly 50 minerals can be found (Mindat has it at 42 with 12 TL's). It is probably a world record in terms of new minerals per volume according to Pekov. It is a "hyperalkaline" pegmatite according to Pekov. This is type locality for Lovardite.


Lovdarite

Formula
K2Na6Be4Si14O36·9H2
Crystal System
Orthorhombic 
Crystal Habit
Prismatic, Radial 
Cleavage
Distinct, Distinct, Distinct 
Luster
Vitreous (Glassy) 
Color
colorless, yellow, yellowish white, white 
Streak
white 
Class
Orthorhombic - Pyramidal 
Hardness
5-6 
Collection
Phillips Collection
Special Info
Type Locality
Mineralpedia
View Lovdarite
On Dakota Matrix
Previously Sold Lovdarite
On Dakota Matrix
Other Available Lovdarite
WebMineral
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Mindat
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SOLD
Montebrasite - 39101
Montebrasite - 39101

Montebrasite

#39101
Locality
Midnight Owl mine, Yavapai Co., Arizona, United States 
Formula
LiAlPO4(OH) 
Availability
Sold
Size
6.5 x 4.5 x 4.5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Pure white mass of primary Montebrasite.


Montebrasite

Formula
LiAlPO4(OH) 
Crystal System
Triclinic 
Crystal Habit
Massive - Granular, Prismatic 
Cleavage
Perfect, Good, Distinct 
Luster
Vitreous - Greasy 
Color
bluish, colorless, greenish, greenish gray, gray white 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle - Conchoidal 
Hardness
5.5-6 

Moraesite

#PD40405
Locality
Itinga, Minas Gerais, Brazil 
Formula
Be2PO4(OH)·4H2
Availability
Sold
Size
3.5 x 2.5 x 2.5 cm - Miniature 
Tagged
phosphate , beryllium , pegmatite mineral  

A very light weight mass of white, acicular bundles of crystals. Itinga is a pegmatite district, and the exact locality of this specimen is not known,


Moraesite

Formula
Be2PO4(OH)·4H2
Crystal System
Monoclinic 
Crystal Habit
Spherical, Druse, Encrustations 
Cleavage
Perfect, None, None 
Color
white 
Streak
white 
Class
Monoclinic 
Hardness
Collection
Phillips Collection
Mineralpedia
View Moraesite
On Dakota Matrix
Previously Sold Moraesite
On Dakota Matrix
Other Available Moraesite
WebMineral
View Moraesite
Mindat
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SOLD
Moraesite - PD40510
Moraesite - PD40510

Moraesite

#PD40510
Locality
Londonderry Lithium deposit, Western Australia, Australia 
Formula
Be2PO4(OH)·4H2
Availability
Sold
Size
5 x 3 x 2 cm - Miniature 
Tagged
phosphate , beryllium , pegmatite mineral  

The Moraesite on this specimen is poor, it is just a representative specimen for this locality. It a complex, zoned granitic pegmatite rich in lithium and virtually no phosphate. As such all lithium formed lithium silicates - spodumene, petalite, eucryptite. Moraesite seems to be the only phosphate.


Moraesite

Formula
Be2PO4(OH)·4H2
Crystal System
Monoclinic 
Crystal Habit
Spherical, Druse, Encrustations 
Cleavage
Perfect, None, None 
Color
white 
Streak
white 
Class
Monoclinic 
Hardness
Collection
Phillips Collection
Mineralpedia
View Moraesite
On Dakota Matrix
Previously Sold Moraesite
On Dakota Matrix
Other Available Moraesite
WebMineral
View Moraesite
Mindat
View Moraesite

Mosandrite

with Amphibole - #PD40489
Locality
Låven, Langesundsfjorden, Larvik, Vestfold, Norway 
Formula
(Ca,Ce)4(□,Ca,Na)3Ti(Si2O7)2(H2O,OH,F)4·H2
Availability
Sold
Size
10.5 x 7 x 6.5 cm - Cabinet 
Tagged
REE mineral , pegmatite mineral  

A large pegmatitic specimen with a huge, long blade of Mosandrite, a Cerium rich silicate found in the nepheline-syenite pegmatites of Langesundsfjorden. The crystal is 10cm long.


Mosandrite

Formula
(Ca,Ce)4([box],Ca,Na)3Ti(Si2O7)2(H2O,OH,F)4·H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic 
Cleavage
Good, None, None 
Luster
Vitreous (Glassy) 
Color
yellow, yellowish green, reddish brown, brown 
Streak
yellow green 
Class
Monoclinic - Sphenoidal 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Phillips Collection

Muscovite

- Biotite (mixture) aka gigantolite ps after Cordierite - #PD40418
Locality
Lemn‪äs, Kemiö Island, Finland 
Formula
KAl2(Si3Al)O10(OH)2 
Availability
Sold
Size
6 x 5 x 6 cm - Sm Cabinet 
Tagged
pegmatite mineral  

This is a weird one, one of which had been described in the old literature as "gigantolite" in reference to it huge, gigantic crystals once though to be a unique mineral. Later studies proved it to be only a mixture of micas. The old Excalibur and Heinrich label indicates that it is a variety of topaz, which evidently it is not.


Muscovite

Formula
KAl2(Si3Al)O10(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Lamellar, Foliated, Micaceous 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white, gray, silver white, brownish white, greenish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Sectile 
Hardness
2-2.5 
Collection
Phillips Collection
Mineralpedia
View Muscovite
On Dakota Matrix
Previously Sold Muscovite
On Dakota Matrix
Other Available Muscovite
WebMineral
View Muscovite
Mindat
View Muscovite

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