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Oligoclase Oligoclase has the formulae (Na, Ca)Al Si3O8 and a relative hardness of 7. It is found lining and filling cavities in igneous and sedimentary rocks where it's been deposited by hot waters.
It's name is derived from the characteristic olive green colour. A clear green variety is called peridot and has some uses as a gem. Opal Opal has the formulae Si O2n H2O and a relative hardness of 6.
Orthorhombic Orthorhombic refers to a rectangular crystal with three axes of different lengths and all at right angles to each other. Oxide Oxide refers to a group of minerals where oxygen joined with a metal is a major constituent.
Oxidized zone Oxidized zone refers to the portion of an ore body that has been altered by downward percolating groundwater and which contains dissolved oxygen and carbon dioxide.
Orpiment Orpiment has the formulae As2S3 and a relative hardness of 2.
Orthoclase Orthoclase has the formulae KAl Si3O8 and a relative hardness of 6.It is used in the manufacture of porcelin and for other industrial purposes. Olivine Olivine has the formulae (Mg, Fe)2Si O4 and a relative hardness of 7.The ordinary varieties are common but the precious varieties are quite valuable.It is used in an alloy with gold in dentistry and jewelry.