Strictly speaking obsidian is not a rock as it is not composed of crystals so can't be mineralic! It is technically a volcanic glass.
It's Moh's hardness is approximately 5-6 according to the Wikipedia entry for Obsidian although an exact value would depend on the exact composition of the Obsidian in question.
Pitchstone is a rock; and therefore doesn't have a single hardness. Obsidian is technically not a mineral as it doesn't have a crystalline structure, however it isn't a mixture and has a hardness of roughly 5 - 5.5.On Mohs scale of hardness, obsidian is about 5, which can just be scratched with glass.
Obsidian and pitchstone have a similar hardness of around 5 to 5.5 on the Mohs Scale of hardness. This means they are relatively hard materials and can scratch glass, but they can still be scratched by harder materials like quartz.
about 7 or 7.5 with Mohs scale, like Quartz.
Azurite has a hardness of 3.5 to 4 on the Mohs hardness scale.
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
Pitchstone is a rock; and therefore doesn't have a single hardness. Obsidian is technically not a mineral as it doesn't have a crystalline structure, however it isn't a mixture and has a hardness of roughly 5 - 5.5.On Mohs scale of hardness, obsidian is about 5, which can just be scratched with glass.
Obsidian and pitchstone have a similar hardness of around 5 to 5.5 on the Mohs Scale of hardness. This means they are relatively hard materials and can scratch glass, but they can still be scratched by harder materials like quartz.
about 7 or 7.5 with Mohs scale, like Quartz.
Azurite has a hardness of 3.5 to 4 on the Mohs hardness scale.
Diatomite has a hardness of around 5.5 on the Mohs scale of hardness.
The hardness of Limonite is 4 t0 5.5 on the mohs hardness scale.
flint is a type of quartz, so it has a hardness of about 7 on the mohs scale of hardness
it is 6 1/2 in the mohs hardness scale
It's called the Ore
The Mohs hardness of sodium chloride is 2,5. The Mohs hardness is established by comparison with other minerals, having a known hardness.
Dolomite has a hardness of 3.5-4 on the Mohs scale of hardness.
I don't found the Mohs hardness of plutonium but: - the Brinell hardness is 242 at r.m. - the Vickers hardness is 255 at r.m. After a hardness conversion chart an equivalent Mohs hardness may be 3,7.