Tschermakite
A variety of Minerals
What is Tschermakite?
The endmember hornblende tschermakite (☐Ca2(Mg3Al2)(Si6Al2)O22(OH)2) is a calcium rich monoclinic amphibole mineral. It is frequently synthesized along with its ternary solid solution series members tremolite and cummingtonite so that the thermodynamic properties of its assemblage can be applied to solving other solid solution series from a variety of amphibole minerals.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Tschermakite 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.
Tschermakite Localities Map
See where Tschermakite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Characteristics of Tschermakite
A hand specimen of tschermakite is green to black in color; its streak will be greenish white. It can be transparent to translucent and has a vitreous luster. Tschermakite shows the characteristic amphibole perfect cleavage on [110]. Its average density is 3.24, with a hardness of 5–6; its fracture will be brittle to conchoidal. In thin section its optic sign and 2V angle cover a wide range and are not very useful for identification. It shows a distinct pleochroism in browns and greens.
Quick Facts
Physical Properties
- Color
- Medium green to dark green to green-black to black, brown (rare).
- Hardness (Mohs)
- 5 - 6
- Density
- 3.25 g/cm³
- Streak
- Pale grey-green
Chemical Properties
- Chemical Formula
- ☐(Ca2)(Mg3Al2)(Al2Si6O22)(OH)2
- Elements
- Al, Ca, H, Mg, O, Si
Also Known As
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Tschermakite FAQs
How do I identify Tschermakite?
Tschermakite can be identified by its hardness of 5 - 6 on the Mohs scale, Medium green to dark green to green-black to black color. Look for these key characteristics when examining specimens.
What color is Tschermakite?
Tschermakite typically appears in Medium green to dark green to green-black to black, brown (rare).. Color can vary depending on impurities and formation conditions.
How hard is Tschermakite?
Tschermakite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.
What is the characteristics of tschermakite of Tschermakite?
A hand specimen of tschermakite is green to black in color; its streak will be greenish white. It can be transparent to translucent and has a vitreous luster. Tschermakite shows the characteristic amphibole perfect cleavage on [110]. Its average density is 3.24, with a hardness of 5–6; its fracture will be brittle to conchoidal. In thin section its optic sign and 2V angle cover a wide range and are not very useful for identification. It shows a distinct pleochroism in browns and greens.
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