dolomite

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Relations between lamellar twinning and cleavage planes in dolomite and calcite. This difference can be discerned best when thin sections of the minerals are viewed under a microscope.

Figure 41: Typical crystal forms of magnetite. (Left) An octahedron and (right) an octahedron modified by dodecahedral faces.

Anhydrite from Lockport, N.Y.

Figure 42: Granitic rock consisting of reddish orange feldspar, nearly white quartz, and green epidote that appears to have been introduced into an original quartz-feldspar granite. This rock, sometimes called unakite, is used widely in jewelry.

Dolomite from Corydon, Ind.

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Photos

Relations between lamellar twinning and cleavage planes in dolomite and calcite. This difference can be discerned best when thin sections of the minerals are viewed under a microscope.

Figure 41: Typical crystal forms of magnetite. (Left) An octahedron and (right) an octahedron modified by dodecahedral faces.

Anhydrite from Lockport, N.Y.

Figure 42: Granitic rock consisting of reddish orange feldspar, nearly white quartz, and green epidote that appears to have been introduced into an original quartz-feldspar granite. This rock, sometimes called unakite, is used widely in jewelry.

Dolomite from Corydon, Ind.

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Topics

dolomite group kutnohorite

Key People

Dieudonné Dolomieu

French geologist