what would be the hardness of a mineral that is softer than quartz but harder than apatite?
Science aside, they apparently have healing properties too.^^
that it's actually one big molecule of SiO4, or silicate.
to correct the other person, it's SiO2 also vitrous luster comes in almost every color conchoidal fracture hardness 7 hexagonal crystal group has 6 sided crystals that end in a point no cleavage white streak also is piezoelectric, which means it can build up an electric charge
