Anorthoclase
A variety of Albite
What is Anorthoclase?
The mineral anorthoclase ((Na,K)AlSi3O8) is a crystalline solid solution in the alkali feldspar series, in which the sodium-aluminium silicate member exists in larger proportion. It typically consists of between 10 and 36 percent of KAlSi3O8 and between 64 and 90 percent of NaAlSi3O8.
Healing Properties
Anorthoclase is believed to improve memory and cognitive thinking skills. It works with the Crown chakra to stimulate the brain and provide for better clarity and focus. Many use it during meditation to release energy from the Third Eye chakra and help them understand dreams or visions. Can be worn, carried, or placed in the home or workplace.
Optical Properties
- Refractive Index
- 1.518-1.534
- Birefringence
- 0.006-0.008
- Pleochroism
- Weak
- Optical Character
- Biaxial negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Anorthoclase before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Anorthoclase Localities Map
See where Anorthoclase is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Anorthoclase
Anorthoclase occurs in high temperature sodium rich volcanic and hypabyssal (shallow intrusive) rocks. The mineral is typically found as a constituent of the fine grained matrix or as small phenocrysts which may occur as loose crystals in a weathered rock. It was first described in 1885 for an occurrence on Pantelleria Island, Trapani Province, Sicily. The name is from the Greek αν, ορθός and κλάσις (not cleaving at right-angles), for its oblique cleavage.
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Quick Facts
Physical Properties
- Color
- Colorless, white, pale creamy yellow, red, green
- Streak
- White
Chemical Properties
- Chemical Formula
- (Na,K)AlSi3O8
- Elements
- Al, Na, O, Si
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Anorthoclase FAQs
How do I identify Anorthoclase?
Anorthoclase can be identified by its Colorless color. Look for these key characteristics when examining specimens.
What color is Anorthoclase?
Anorthoclase typically appears in Colorless, white, pale creamy yellow, red, green. Color can vary depending on impurities and formation conditions.
What is the formation of anorthoclase of Anorthoclase?
Anorthoclase occurs in high temperature sodium rich volcanic and hypabyssal (shallow intrusive) rocks. The mineral is typically found as a constituent of the fine grained matrix or as small phenocrysts which may occur as loose crystals in a weathered rock. It was first described in 1885 for an occurrence on Pantelleria Island, Trapani Province, Sicily. The name is from the Greek αν, ορθός and κλάσις (not cleaving at right-angles), for its oblique cleavage.
