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Feldspars & Feldspathoids

Friday, 18 August 2017 12:30 PM

Feldspars are found in nearly every geological environment. We will have a nice group feldspars and feldspathoids which represents these diverse deposits.

Albite

var. pericline - #PD46624
Locality
South Tyrol, Trentino, Italy 
Formula
NaAlSi3O8 
Availability
Sold
Size
10 x 5 x 4 cm - Cabinet 

Pericline crystal group with white glossy crystals to 2cm. The crystals are elongated by twinning on the b-axis with long inclined faces along the prism.


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. andesine - #PD47318
Locality
Cape Grant, Victoria, Australia 
Formula
NaAlSi3O8 
Availability
Sold
Size
4 x 2.5 x 3 cm - Miniature 

Andesine is a variety of Albite composed of 50-70% Albite and 30-50% Anorthite. It is of a late a fine red gem but can be yellow and green, obviously this specimen is not a gem.  Associated with this Andesite are black crystal plates of ilmenite.


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
Mineralpedia
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On Dakota Matrix
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Albite

var. oligoclase - #BM47320
Locality
Commercial quarry, Crestmore, Riverside Co., California, United States 
Formula
NaAlSi3O8 
Availability
Sold
Size
7 x 3.5 x 3.5 cm - Sm Cabinet 

Colorless to light greyish white, glassy oligoclase with Diopsode and garnet.


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
McConlogue Collection
Mineralpedia
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Albite

var. cleavelandite - #PD47321
Locality
Itinga, Minas Gerais, Brazil 
Formula
NaAlSi3O8 
Availability
Sold
Size
5 x 4 x 3.5 cm - Miniature 

Cleavelandite is white to colorless and platy variety of Albite found in pegmatites. Cleavelandite is usually found along the fringes or outer zones of the pegmatites.


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
Mineralpedia
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On Dakota Matrix
Previously Sold Albite
On Dakota Matrix
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Mindat
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Albite

var. cleavelandite - #PD47322
Locality
Pine Mountain quarry, Adams Co., Pennsylvania, United States 
Formula
NaAlSi3O8 
Availability
Sold
Size
7 x 4 x 2 cm - Sm Cabinet 

White platy crystals, the variety of Albite called 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
Mineralpedia
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On Dakota Matrix
Previously Sold Albite
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Albite

var. sunstone - #47325
Locality
Hart Mountain, Harney Co., Oregon, United States 
Formula
NaAlSi3O8 
Availability
Sold
Size
3.5 x 1.5 x 1 cm - Miniature 
Special Info
Gem Quality 

Gemmy yellow Albite, supposedly "sunstone".


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
Special Info
Gem Quality
Mineralpedia
View Albite
On Dakota Matrix
Previously Sold Albite
On Dakota Matrix
Other Available Albite
WebMineral
View Albite
Mindat
View Albite

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