Table of Contents
What is the hardness of garnet schist?
| Garnet | |
|---|---|
| Mohs scale hardness | 6.5–7.5 |
| Luster | vitreous to resinous |
| Streak | White |
| Specific gravity | 3.1–4.3 |
What grade is garnet schist?
Garnet-Mica Schist
| Type | Metamorphic Rock |
|---|---|
| Color | Shiny, medium gray |
| Miscellaneous | Small-sized dark red-brown garnets on foliation surfaces |
| Metamorphic Type | Regional |
| Metamorphic Grade | Middle Grade (Middle P – Middle T) |
Where is garnet on the hardness scale?
Garnets should not be subjected to any hard blows or rough wear. Depending on type, garnet hardness ranges from 6.5 to 7.5 on the Mohs scale. Garnets are stable to light and chemicals. They can be attacked by hydrofluoric acid.
What is the grade of schist?
Schist is medium grade metamorphic rock, formed by the metamorphosis of mudstone / shale, or some types of igneous rock, to a higher degree than slate, i.e. it has been subjected to higher temperatures and pressures. Due to the more extreme formation conditions, schist often shows complex folding patterns.
What is the density of a garnet?
3.93-4.30
Table of Specific Gravity Values
| Gemstone | Density |
|---|---|
| Zircon | 3.93-4.73 |
| Almandine garnet | 3.93-4.30 |
| Hodgkinsonite | 3.91-3.99 |
| Sphalerite | 3.90-4.10 |
Is Garnet a soft stone?
A garnet, on the other hand, is quite a soft stone and ranks at 6.5 to 7.5. If the stone you’re holding scratches easily and by a substance of a hardness ranking below 9, then it is probably a garnet.
Is garnet high grade?
Chlorite, muscovite, biotite, garnet, and staurolite are index minerals representing a respective sequence of low-to-high grade rock.
What is the density of garnet?
Gemstone Density: The Definitive Guide
| Gem Variety | Density | Chemical Composition |
|---|---|---|
| Color-Change Garnet | 3.78-3.85 | Complex aluminum silicate |
| Malaia Garnet | 3.78-3.85 | Complex aluminum silicate |
| Gaspeite | 3.71 | Nickel magnesium iron carbonate |
| Demantoid Garnet | 3.7-4.1 | Calcium iron silicate |
What is the hardness of tanzanite?
6 – 6.5
Tanzanite/Hardness (Mohs hardness scale)
What is Tanzanite density?
1.69–1.70. Birefringence. 0.006–0.018. Pleochroism. Present, dichroism or trichroism, depending on heat treatment.