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Sinuous; curving in alternate directions.
A hard rock of varied mineral content; volcanic in origin, it makes up much of the Earth's crust.
Hard transparent minerals that are often used as gemstones and abrasives.
A translucent gemstone, an orthoclase feldspar, that has a pearly lustre.
The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.
A solid (mineral quartz or otherwise) composed of an array of atoms possessing long-range order and arranged in a pattern which is periodic in three dimensions.
a clear deep blue variety of corundum, valued as a precious stone.
The name of a group of hydrous aluminosilicate minerals characterized by highly perfect cleavage, so that they readily separate into very thin leaves, more or less elastic.
A variety of translucent quartz, spangled throughout with scales of yellow mica.
A person who cuts, polishes, engraves, or deals in gems.
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garnet
Hard transparent minerals that are often used as gemstones and abrasives.
sapphire
a clear deep blue variety of corundum, valued as a precious stone.
lapidary
A person who cuts, polishes, engraves, or deals in gems.
moonstone
A translucent gemstone, an orthoclase feldspar, that has a pearly lustre.
basalt
A hard rock of varied mineral content; volcanic in origin, it makes up much of the Earth's crust.
quartz
The most abundant mineral on the earth's surface, of chemical composition silicon dioxide, SiO2. It occurs in a variety of forms, both crystalline and amorphous. Found in every environment.
serpentine
Sinuous; curving in alternate directions.
aventurine
A variety of translucent quartz, spangled throughout with scales of yellow mica.
crystal
A solid (mineral quartz or otherwise) composed of an array of atoms possessing long-range order and arranged in a pattern which is periodic in three dimensions.
synonyms: grain.
