Alkali Feldspar
Alkali Feldspar Group
A variety of Feldspar Group
What is Alkali Feldspar?
Alkali Feldspar, a subgroup of feldspar minerals, encompasses a range of potassium-rich and calcium-poor minerals, including orthoclase and microcline. Alkali Feldspar is an essential component of many igneous rocks, exhibiting a diverse color palette from white and pink to green and gray. Alkali Feldspar is widely used in the production of decorative stones, ceramics, and as a gemstone in jewelry due to its lustrous appearance and durability.
Discover Values
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Alkali Feldspar 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.
Alkali Feldspar Localities Map
See where Alkali Feldspar is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- White to gray or colorless, greenish white, grayish yellow, pale pink, tan, bluish green, green, etc.
- Hardness (Mohs)
- 6 - 6.5
- Density
- 2.5 - 2.6 g/cm³
- Streak
- White
- Luster
- Vitreous
- Crystal System
- Monoclinic, Triclinic
Chemical Properties
- Chemical Formula
- K(AlSi₃O₈)
- Elements
- Al,K,Na,O,Si
Also Known As
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Alkali Feldspar FAQs
How do I identify Alkali Feldspar?
Alkali Feldspar can be identified by its hardness of 6 - 6.5 on the Mohs scale, White to gray or colorless color, Vitreous luster, Monoclinic, Triclinic crystal system. Look for these key characteristics when examining specimens.
What color is Alkali Feldspar?
Alkali Feldspar typically appears in White to gray or colorless, greenish white, grayish yellow, pale pink, tan, bluish green, green, etc.. Color can vary depending on impurities and formation conditions.
How hard is Alkali Feldspar?
Alkali Feldspar has a hardness of 6 - 6.5 on the Mohs scale. This gives it moderate hardness.
