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London Pegmatite Specimens

Tuesday, 30 July 2024 01:00 PM

London wrote the book called "PEGMATITES". It is the most in-depth book on the geology and mineralogy of pegmatites to-date. This Special Edition will include specimens used as illustrations in London's book. If you like pegmatites do not miss this one!

SOLD

Eucryptite

& Albite ps after Spodumene - #DL63816

Details
Data
Provenance
Resources

Locality: Branchville quarry, Branchville, Fairfield Co., Connecticut, United States
Formula: LiAlSiO₄
Availability: Sold
Size: 8 x 6.5 x 6.5 cm - Sm Cabinet
Tagged: pegmatite mineral , lithium
Special Info: Illustrated in London's book "Pegmatites"

Great specimen with a few Spodumene crystals one of which was replaced by Eucryptite and is intense red as seen in the fluorescent photos. Illustrated on page 56, Fig. 4-9f. Another pink Spodumene crystal is partially replaced. as seen in the other FL photos.

Eucryptite

Formula: LiAlSiO₄
Crystal System: Trigonal
Cleavage: Indistinct, None, None
Luster: Vitreous (Glassy)
Color: brown, colorless, white
Streak: white
Class: Trigonal - Rhombohedral
Fracture: Brittle - Conchoidal
Hardness: 6.5

Collection: Dr. David London Collection
Special Info: Illustrated in London's book "Pegmatites"

Mineralpedia: View Eucryptite
On Dakota Matrix: Previously Sold Eucryptite
On Dakota Matrix: Other Available Eucryptite
WebMineral: View Eucryptite
Mindat: View Eucryptite

SOLD

Eucryptite

#DL63820

Details
Data
Provenance
Resources

Locality: Bikita Pegmatite, Masvingo dist., Zimbabwe
Formula: LiAlSiO₄
Availability: Sold
Size: 7.5 x 5.5 x 7.5 cm - Sm Cabinet
Tagged: pegmatite mineral , lithium
Special Info: Illustrated in London's book "Pegmatites"

Intensely fluorescent crimson red Eucryptite.

Illustrated on page 56 of London's book on "Pegmatites".

Eucryptite

Formula: LiAlSiO₄
Crystal System: Trigonal
Cleavage: Indistinct, None, None
Luster: Vitreous (Glassy)
Color: brown, colorless, white
Streak: white
Class: Trigonal - Rhombohedral
Fracture: Brittle - Conchoidal
Hardness: 6.5

Collection: Dr. David London Collection
Special Info: Illustrated in London's book "Pegmatites"

Mineralpedia: View Eucryptite
On Dakota Matrix: Previously Sold Eucryptite
On Dakota Matrix: Other Available Eucryptite
WebMineral: View Eucryptite
Mindat: View Eucryptite

SOLD

Fluorapatite

skeletal in Albite - #DL63818

Details
Data
Provenance
Resources

Locality: Black Mountain pegmatite, Rumford, Oxford Co., Maine, United States
Formula: Ca₅(PO₄)₃F
Availability: Sold
Size: 13.5 x 14 x 2.5 cm - Cabinet
Tagged: phosphate , pegmatite mineral
Special Info: Illustrated in London's book "Pegmatites"

Large slab showing skeletal growth of Fluorapatite in Albite. Illustrated on page 61 Fig. 4-12L.

Fluorapatite

Formula: Ca₅(PO₄)₃F
Crystal System: Hexagonal
Crystal Habit: Massive - Granular, Euhedral Crystals
Cleavage: Indistinct, None, None
Luster: Vitreous - Resinous
Color: blue, brown, colorless, violet, green
Streak: white
Class: Hexagonal - Dipyramidal
Fracture: Brittle - Conchoidal
Hardness: 5

Collection: Dr. David London Collection
Special Info: Illustrated in London's book "Pegmatites"

Mineralpedia: View Fluorapatite
On Dakota Matrix: Previously Sold Fluorapatite
On Dakota Matrix: Other Available Fluorapatite
WebMineral: View Fluorapatite
Mindat: View Fluorapatite

SOLD

Holmquistite

with Epidote - #DL63809

Details
Data
Provenance
Resources

Locality: Harding mine, Taos Co., New Mexico, United States
Formula: □Li₂(Mg₃Al₂)Si₈O₂₂(OH)₂
Availability: Sold
Size: 13 x 6 x 3 cm - Cabinet
Tagged: lithium

This is a good example of replacement of minerals in the wall rock of pegmatites. This specimen formed as a result of lithium solutions emanting from the final stages of the pegmatite. The lithium intruded the amphibolite and converted the Hornblende to Holmquisite. London discusses wall rock alteration on pages 115-125 in the book "Pegmatites".