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Mineralpedia Details for Albite

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Albite

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
WebMineral
View Albite 
Mindat
View Albite 

Albite from Conselheiro Pena, Minas Gerais, Brazil

Albite
            from Conselheiro Pena, Minas Gerais, Brazil

These are some of the larger Albite crystals you'll see of Albite. The crystals are a pearly white color and are tabular to 3.5cm across! There is very little to no damage, although there is some natural etching on some of the faces. There are also large 3cm Muscovite crystals.

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Albite from Macomb, St. Lawrence Co., New York, United States

Albite
            from Macomb, St. Lawrence Co., New York, United States

White crystals with blue schiller effect in places. 

Cabinet specimen and crystal aggregate with many faces displaying blue iridescent reflections. According to Sinkankas, peristite should reflect a variety of hues and a hue of blue only is usually reserved for moonstone. Moonstone however should have a schiller effect. This specimen does not. To be consistent with locality information on Mindat and the old label, this specimen will be termed peristerite. As is typical of plagioclase feldspar, polysynthetic or albite twinning can be see along some faces as striations.

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Albite var. Oligoclase from Arendal, Aust-Agder, Norway

Albite var. Oligoclase
            from Arendal, Aust-Agder, Norway
Special Info
Antique Specimen

This is a variety of Albite called oligoclase, which should contain at least 70% Na, so very close to end member Albite. Tilting this specimen back and forth you will see tiny reflections of oriented hematite crystals withing the oligoclase. This property is gives the name "sunstone" to some oligoclase.

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Albite var. pericline from Pfitsch Tal, Tyrol, Austria

Albite var. pericline
            from Pfitsch Tal, Tyrol, Austria

This is a variety of Albite, known as pericline, taking its name from the Greek word, periklinis, or inclined on all sides (Mindat).  Pericline is the variety of Albite with a glazed porcelain-like luster and milky white color. Pericline is elongated and twinned along the b-axis and thus have long tapering faces along the prism form.

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Albite var. pericline from Saflisch Valley, Binn Valley, Wallis, Switzerland

Albite var. pericline
            from Saflisch Valley, Binn Valley, Wallis, Switzerland

Lustrous white elongated crystals to 1.4cm, var. pericline.

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Albite intermediate member Labradorite from Woodward Ranch, Alpine, Brewster Co., Texas, United States

Albite intermediate member Labradorite
            from Woodward Ranch, Alpine, Brewster Co., Texas, United States
Special Info
Gem Quality

Light yellow gemmy labradorite. This material has weathered out of basalts. This labradorite has no schiller effect since there there are probably no exsolved layering which causes the labradorescence (schiller).

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Albite var. andesine from Cape Grant, Victoria, Australia

Albite var. andesine
            from Cape Grant, Victoria, Australia

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.

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Albite var. pericline from South Tyrol, Trentino, Italy

Albite var. pericline
            from South Tyrol, Trentino, Italy

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.

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Albite intermediate member Labradorite from Ylämaa, Lappeenranta, Finland

Albite intermediate member Labradorite
            from Ylämaa, Lappeenranta, Finland

This is one of the most famous localities for labradorite and locally called "spectrolite". The specimen is a large coarse crystalline mass with tightly packed crystals to over 1cm. Many of the crystals show excellent play of colors or schiller effect caused by exsolved lamellae. Labradorite is not a variety but a defined mineral species within the plagioclase series at least according to Mindat. I never understood this since Bytwonite is a variety within the same series and not granted species status. 

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Albite var. Oligoclase from Commercial quarry, Crestmore, Riverside Co., California, United States

Albite var. Oligoclase
            from Commercial quarry, Crestmore, Riverside Co., California, United States

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

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Albite var. cleavelandite from Itinga, Minas Gerais, Brazil

Albite var. cleavelandite
            from Itinga, Minas Gerais, Brazil

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.

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Albite var. cleavelandite from Pine Mountain quarry, Adams Co., Pennsylvania, United States

Albite var. cleavelandite
            from Pine Mountain quarry, Adams Co., Pennsylvania, United States

White platy crystals, the variety of Albite called cleavelandite. 

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Albite var. sunstone from Hart Mountain, Harney Co., Oregon, United States

Albite var. sunstone
            from Hart Mountain, Harney Co., Oregon, United States
Special Info
Gem Quality

Gemmy yellow Albite, supposedly "sunstone".

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