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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.

Laueite

with Strengite & Bermanite - #PD40442
Locality
Mangualde, Viseu dist., Portugal 
Formula
Mn2+Fe3+2(PO4)2(OH)2·8H2
Availability
Sold
Size
6 x 4.5 x 5 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

Yellow Laueite crystals to 0.5mm or more on purple Strengite. Most of the matrix seems to altered to Rockbridgeite. The fringe of the vug which encloses the strengite is Bermanite. There is perhaps some hints of Jahnsite-(CaMnMn). Some areas contain a lot of carbonate apatite. The exact mine locality is not known. The Mangualde district pegmatites are granitic and rich in phosphates. Garske label.


Laueite

Formula
Mn2+Fe3+2(PO4)2(OH)2·8H2
Crystal System
Triclinic 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
yellow orange, honey brown, light brown 
Streak
white 
Class
Triclinic - Pinacoidal 
Hardness
Collection
Phillips Collection
Mineralpedia
View Laueite
On Dakota Matrix
Previously Sold Laueite
On Dakota Matrix
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Mindat
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Leucophanite

#PD40482
Locality
Tvedalen, Larvik, Vestfold, Norway 
Formula
NaCaBeSi2O6
Availability
Sold
Size
6 x 4 x 4 cm - Sm Cabinet 
Tagged
beryllium , pegmatite mineral  

Faint yellow blocky crystals of Leucophanite to 1.5cm in coarse crystalline pegmatite matrix of mostly Plagioclase. Leucophanite was discovered in 1840 on the Island of Låven located in the Langesundsfjorden district. Since then being discovered several pegmatites in Norway (Telemark and Vestfold counties), Greenland (Ilímaussaq complex and Narsaq), Russia (Khibiny Massif of the Kola Peninsula), and Canada (MSH). It is another rare beryllium silicate found in nepheline syenites.

NOTE: The Island of Låven was declared a nature preserve in 1970 because of its unique mineralogy and collecting is prohibited by law.


Leucophanite

Formula
NaCaBeSi2O6
Crystal System
Triclinic 
Crystal Habit
Tabular 
Cleavage
Good, Good, Distinct 
Luster
Vitreous (Glassy) 
Color
white, greenish yellow, yellow, light green 
Streak
white 
Class
Triclinic - Pedial 
Fracture
Brittle 
Hardness
Collection
Phillips Collection
SOLD
Lindbergite - PD40409
Lindbergite - PD40409

Lindbergite

#PD40409
Locality
Boca Rica mine, Sapucaia, Galiléia, Minas Gerais, Brazil 
Formula
MnC2O4·2H2
Availability
Sold
Size
4 x 3 x 2 cm - Miniature 
Tagged
pegmatite mineral  
Special Info
Type Locality 

Earthy white coatings on phosphate matrix first discovered at this locality.


Lindbergite

Formula
MnC2O4·2H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Pseudomorphous 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white, grayish white 
Streak
white 
Class
Monoclinic - Prismatic 
Fracture
Friable 
Hardness
2.5 
Collection
Phillips Collection
Special Info
Type Locality
SOLD
Lithiophilite - 39111
Lithiophilite - 39111

Lithiophilite

#39111
Locality
Midnight Owl mine, Yavapai Co., Arizona, United States 
Formula
LiMn2+PO4 
Availability
Sold
Size
6 x 4 x 4 cm - Sm Cabinet 
Tagged
phosphate , pegmatite mineral  

An old David Shannon stock specimen with the label stating that it is a very pure Mn end member. That is, in the Triphylite-Lithiophilite series, where Triphylite is the lithium end member, while Lithiophilite is the Mn end member. Usually both minerals are somewhere in between that series. It is all the salmon pink area occuring much like the "salmonsite" which occured at the Stweart mine of the Pala district. It is a primary phosphate found chiefly if not exclusively in pegmatites.


Lithiophilite

Formula
LiMn2+PO4 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Perfect, Very Good, Imperfect 
Luster
Vitreous - Resinous 
Color
brown, yellowish brown, salmon, brownish, blackish 
Streak
gray white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal - Uneven 
Hardness
4-5 
SOLD
Lithiophilite - PD40411
Lithiophilite - PD40411

Lithiophilite

#PD40411
Locality
Foote mine, Cleveland Co., North Carolina, United States 
Formula
LiMn2+PO4 
Availability
Sold
Size
2.5 x 2 x 1 cm - Thumbnail 
Tagged
phosphate , pegmatite mineral  

A nice, slender 3mm crystal with fluorapatite from this famous lithium-rich pegmatite.


Lithiophilite

Formula
LiMn2+PO4 
Crystal System
Orthorhombic 
Crystal Habit
Prismatic 
Cleavage
Perfect, Very Good, Imperfect 
Luster
Vitreous - Resinous 
Color
brown, yellowish brown, salmon, brownish, blackish 
Streak
gray white 
Class
Orthorhombic - Dipyramidal 
Fracture
Conchoidal - Uneven 
Hardness
4-5 
Collection
Phillips Collection

Londonite

- Rhodizite - #PD31051
Locality
Antsongomvato mine, Betroka dist., Antananarivo, Madagascar 
Formula
CsBe5Al4B11O28 
Availability
Sold
Size
5 x 3 x 3.5 cm - Miniature 
Tagged
beryllium , pegmatite mineral  

Dr. David london analyzed 50 plus Londonites-Rhodizite and found them all to be zoned and mostly rimmed by Londonite, the cesium-dominant analogue Rhodizite. This specimen contains a large 1cm complete crystal about three-quarter of which is well exposed.


Londonite

Formula
CsBe5Al4B11O28 
Crystal System
Isometric 
Crystal Habit
Euhedral Crystals 
Cleavage
None, None, None 
Luster
Vitreous (Glassy) 
Color
colorless, white, yellow 
Streak
white 
Class
Isometric - Hextetrahedral 
Fracture
Brittle - Conchoidal 
Hardness
Collection
Phillips Collection
Mineralpedia
View Londonite
On Dakota Matrix
Previously Sold Londonite
On Dakota Matrix
Other Available Londonite
WebMineral
View Londonite
Mindat
View Londonite

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