Minerals
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| − | Minerals are natural occurring, inorganic materials of consistent chemical composition. Usually their atoms are arranged in a definite crystal structure. Most [[Gemstones|gemstones]] are minerals. Since they have a uniform chemical composition each mineral has consistent set of physical and optical properties. | + | '''Minerals''' are natural occurring, inorganic materials of consistent chemical composition. Usually their atoms are arranged in a definite crystal structure. Most [[Gemstones|gemstones]] are minerals. Since they have a uniform chemical composition each mineral has consistent set of physical and optical properties. |
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| + | ==Mineraloids== | ||
| + | Material found in the earth that originated from living organisms such as amber and jet are called mineraloids. | ||
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| + | ==Rocks== | ||
| + | Rocks are a combination of two or more minerals. Gemstones such as lapis lazuli which is a mixture if lazurite, calcite and sometimes pyrite are classified as rocks. | ||
[[Category:Gemology]] | [[Category:Gemology]] | ||
Revision as of 14:46, 1 August 2013
Minerals are natural occurring, inorganic materials of consistent chemical composition. Usually their atoms are arranged in a definite crystal structure. Most gemstones are minerals. Since they have a uniform chemical composition each mineral has consistent set of physical and optical properties.
Mineraloids
Material found in the earth that originated from living organisms such as amber and jet are called mineraloids.
Rocks
Rocks are a combination of two or more minerals. Gemstones such as lapis lazuli which is a mixture if lazurite, calcite and sometimes pyrite are classified as rocks.