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Pegmatite Textures & Habits

Tuesday, 27 September 2016 10:30 AM

Introducing the "Pegmatite Textures & Habits" gallery which is part of our Special Edition galleries. This gallery contains mineral specimens for sale including albite, and beryl and more from places like Little Three mine, San Diego Co., California, United States, Harding mine, Taos Co., New Mexico, United States, Morro Velho mine, Nova Lima, Minas Gerais, Brazil, Cruzeiro mine, São José da Safira, Doce valley, Minas Gerais, Brazil, and Beauregard mine, Alstead, Cheshire Co., New Hampshire, United States.

Albite

var. Cleavelandite - #PD33148
Locality
Little Three mine, San Diego Co., California, United States 
Formula
NaAlSi3O8 
Availability
Sold
Size
5.5 x 3.5 x 2.5 cm - Sm Cabinet 
Tagged
pegmatite mineral  

Colorless, bladed Albite crystals variety cleavelandite. 


Albite

Formula
NaAlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Blocky, Striated, Granular 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
white, gray, greenish gray, bluish green, gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Collection
Phillips Collection
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Albite

var. cleavelandite with Muscovite - #DH42035
Locality
Harding mine, Taos Co., New Mexico, United States 
Formula
NaAlSi3O8 
Availability
Sold
Size
15 x 10 x 7 cm - Cabinet 
Tagged
pegmatite mineral  

Large specimen composed of mostly white platy Albite with rose colored Muscovite. The habit of this specimen is coarse and platy, which is typical of the variety called "cleavelandite" and is usually found in the wall zone of a fractionated pegmatite.


Albite

Formula
NaAlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Blocky, Striated, Granular 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
white, gray, greenish gray, bluish green, gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Collection
Hess Collection
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Albite

var. cleavelandite - #45371
Locality
Morro Velho mine, Nova Lima, Minas Gerais, Brazil 
Formula
NaAlSi3O8 
Availability
Sold
Size
9 x 4.5 x 3 cm - Sm Cabinet 
Tagged
pegmatite mineral  

Colorless crystals of cleavelandite, a variety of Albite. These are nice crystals that reach over 1cm. Most Albite seen in pegmatites is platy and massive. This specimen is an exception and is very well crystallized.


Albite

Formula
NaAlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Blocky, Striated, Granular 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
white, gray, greenish gray, bluish green, gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Mineralpedia
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Albite

var. cleavelandite with Muscovite - #45378
Locality
Cruzeiro mine, São José da Safira, Doce valley, Minas Gerais, Brazil 
Formula
NaAlSi3O8 
Availability
Sold
Size
12 x 10 x 7 cm - Cabinet 
Tagged
pegmatite mineral  

Large crystals of Albite variety cleavelandite to 2.5cm with Muscovite. 


Albite

Formula
NaAlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Blocky, Striated, Granular 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
white, gray, greenish gray, bluish green, gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Mineralpedia
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Albite

var. cleavelandite with tourmaline - #BN45379
Locality
Cruzeiro mine, São José da Safira, Doce valley, Minas Gerais, Brazil 
Formula
NaAlSi3O8 
Availability
Sold
Size
10 x 10 x 3 cm - Cabinet 
Tagged
pegmatite mineral  

Typical of Albite in a pegmatite where it form large bladed crystals to over 2cm such as this specimen. It is laced with tiny green, aciular tourmaline crystals. From the Buford Nichols collection.


Albite

Formula
NaAlSi3O8 
Crystal System
Triclinic 
Crystal Habit
Blocky, Striated, Granular 
Cleavage
Perfect, Good, None 
Luster
Vitreous (Glassy) 
Color
white, gray, greenish gray, bluish green, gray 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Uneven 
Hardness
Collection
Dr. Buford L. Nichols Collection
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Beryl

#45374
Locality
Beauregard mine, Alstead, Cheshire Co., New Hampshire, United States 
Formula
Be3Al2Si6O18 
Availability
Sold
Size
12 x 10 x 7 cm - Cabinet 
Tagged
beryllium , pegmatite mineral  

A good example of the coarse crystal nature of pegmatites. This specimen contains a well-formed doubly terminated green, hexagonal Beryl crystal associated with Albite.


Beryl

Formula
Be3Al2Si6O18 
Crystal System
Hexagonal 
Crystal Habit
Crystalline - Coarse, Prismatic, Columnar 
Cleavage
Imperfect, None, None 
Luster
Vitreous - Resinous 
Color
green, blue, yellow, colorless, pink 
Streak
white 
Class
Hexagonal - Dihexagonal Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
7.5-8 
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