Plagioclase
A variety of Feldspar Group
What is Plagioclase?
A major constituent of the Earth's crust, plagioclase is a group of minerals that are frequently used in construction, architecture, and decoration. Some specimens exhibit optical phenomena which make them highly sought after as gems. Many of the rocks collected on the Moon are rich in plagioclase.
Uses & Applications
Plagioclase is a mineral that is most commonly used industrially in the production of ceramics and glass. This is because it has a molecular structure that allows it to form into crystals which, although they are very brittle, have the important qualities of transparency and translucence.
Healing Properties
Plagioclase is said to give you a better understanding of positive vs. negative energy, so you know what to avoid. This knowledge may allow you to follow a more beneficial path and make goal achievement more likely. The belief is that plagioclase eases negative emotions such as fear, anger, and anxiety and provides you with solace in stressful moments.
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Plagioclase 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.
Plagioclase Localities Map
See where Plagioclase is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Composition of Plagioclase
Na2O, CaO, Al2O3, SiO2
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Quick Facts
Physical Properties
- Color
- White, gray, bluish white, etc.
- Hardness (Mohs)
- 6 - 6.5
- Density
- 2.61 - 2.76 g/cm³
- Streak
- White
- Luster
- Vitreous
- Crystal System
- Triclinic
Chemical Properties
- Chemical Formula
- Na(AlSi3O8)-Ca(Al2Si2O8)
- Elements
- Na, Al, Si, O, Ca
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Plagioclase FAQs
How do I identify Plagioclase?
Plagioclase can be identified by its hardness of 6 - 6.5 on the Mohs scale, White color, Vitreous luster, Triclinic crystal system. Look for these key characteristics when examining specimens.
What color is Plagioclase?
Plagioclase typically appears in White, gray, bluish white, etc.. Color can vary depending on impurities and formation conditions.
How hard is Plagioclase?
Plagioclase has a hardness of 6 - 6.5 on the Mohs scale. This gives it moderate hardness.
What is the composition of plagioclase of Plagioclase?
Na2O, CaO, Al2O3, SiO2