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Crystals are formed when the compounds in a mineral are arranged in a repeating pattern. It is a highly transparent glass mineral with a high refractive index.
Extrusive igneous rock consists of mineral crystals that are not observable with the naked eye. Obsidian is an extrusive igneous rock (volcanic glass) where there technically are no mineral crystals.
Transparent tape was originally made from celluloid. All of the windows were transparent except the one in the bathroom. His motives for passing the law were transparent to his colleagues.
Google "Mohs hardness scale". This is a relative hardness scale which compares one mineral's hardness to another. (It is between 3.5 and 5.5 on the Mohs hardness scale)
no
Quartz is not a salt; it is silicon dioxide, SiO2.
orthoclase
a quart is a measure of volume. quartz crystals can scratch some glass, depending on its composition and hardness.
Diamond will scratch anything.
Crystals are formed when the compounds in a mineral are arranged in a repeating pattern. It is a highly transparent glass mineral with a high refractive index.
A few minerals that do not scratch glass come to mind . . . talc, asbestos, mica, for instance.
quartz
n
topaz
No. The hardness of serpentine is 3-4.5, whereas a hardness of at least 7 is needed to scratch glass.
6.0
diamond