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Generally speaking a gemstone is a stone that is beautiful rare and durable resistant to abrasion fracturing Aventurine is a translucent to opaque variety of microcrystalline quartz This mineral is often mistaken for amazonite or jade

Turquoise is an opaque mineral that occurs in beautiful hues of blue bluish After blue bluish green stones are preferred with green and yellowish green

Amazonite is a translucent to opaque feldspar gemstone with a pretty green color It More Amazonite is a translucent to opaque feldspar gemstone with a

Turquoise is an opaque blue to green mineral that is a hydrated phosphate of copper and aluminium with the chemical formula Cu Al6 PO4 4 OH 8·4H2O It is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of years The mine chose to send all ore to the crusher and to concentrate on copper

Other minerals include the stones used to make jewelry brilliant cut It is possible to identify a mineral by its hardness Some minerals like Copper is opaque