Actinolite
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
5.5 – 6.0
Specific Gravity
3.03 – 3.07
Refractive Index
1.6 – 1.63
Crystal System
Monoclinic
Luster
Vitreous
Cleavage
Perfect
Fracture
Uneven
Color
various
Birefringence
0.03
Pleochroism
Distinct: yellow-green - light green - blue-green
Mohs Hardness
| Mohs | Reference mineral | Actinolite |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Actinolite
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
About Actinolite
Actinolite is a dark green to black amphibole mineral that forms elongated, bladed crystals in metamorphic rocks worldwide. The fibrous form was historically used as asbestos, while transparent gem-quality crystals are occasionally faceted for collectors. Its vibrant green color, caused by iron and magnesium, makes it visually striking, and it also occurs as inclusions in nephrite jade.
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Actinolite?
Actinolite is a dark green to black amphibole mineral that forms elongated, bladed crystals in metamorphic rocks worldwide. The fibrous form was historically used as asbestos, while transparent gem-quality crystals are occasionally faceted for collectors. Its vibrant green color, caused by iron and
What is the hardness of Actinolite?
Actinolite has a Mohs hardness of 5.5 to 6.0, making it moderate for use in jewelry.
What color is Actinolite?
Actinolite is primarily Various.
How much does Actinolite cost?
Actinolite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Actinolite?
Actinolite belongs to the Monoclinic crystal system.