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It is glassy.
mainly glassy with amygdules and glass
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)
I can break like glass (fracture) and it looks like black glass and can be sharp
no
orthoclase
Diamond will scratch anything.
A few minerals that do not scratch glass come to mind . . . talc, asbestos, mica, for instance.
n
quartz
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
Glass that sat out in the southern. Nevada sun a little too long.
Between 3.5 and 5.5 on the Mohs scale of mineral hardness.
Your answer depends on the composition of the 'fake diamond' and the composition of glass. Each mineral has a rating on the Mohs Scale of hardness. The harder mineral will scratch the softer mineral.