Deposits of sedimentary material transported from their source, most notably influenced by erosional forces and gravity
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Tag: <span>A</span>
A cavity or vesicle formed by the presence of trapped gas, in igneous rock, that is filled with such secondary minerals as calcite, quartz, chalcedony, or zeolites
Two or more metals together in a compound
Containing amygdules. See Amygdule
A mineral group including actinolite, anthophyllite, arfvedsonite, cummingtonite, hornblende, richterite, glaucophane, grunerite, anthophyllite, riebeckite, tremolite, and others
The gradual and systematic reduction of a balance in an account over an assigned period
Rocks or minerals lacking crystal structure or form
A variety of translucent to transparent purple to grey coloured quartz common as a semiprecious gemstone. The color results from with ferric iron substitution for silicon
A variation from what is expected or normal, occurring outside of any pattern or prediction
Metal cast in a shape suitable for refining by electrolytic process