Geology: Rock (geology), a naturally occurring aggregate of minerals and/or mineraloids, or an individual piece of rock
Marble, a metamorphic rock resulting from the metamorphism of limestone
GEMSTONE:
A gemstone or gem, also called a precious or semi-precious stone, is a piece of attractive mineral, which — when cut and polished — is used to make jewelry or other adornments.[1] However certain rocks, (such as lapis-lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone.
Units of measure:
Stone (mass), a unit of mass which since the latter half of the twentieth century has been equal to fourteen pounds, i.e. 6.35 kilograms
Stone (Chinese weight), a Chinese unit of weight equal to 120 piculs
or 160 pounds.
Marble, a metamorphic rock resulting from the metamorphism of limestone
GEMSTONE:
A gemstone or gem, also called a precious or semi-precious stone, is a piece of attractive mineral, which — when cut and polished — is used to make jewelry or other adornments.[1] However certain rocks, (such as lapis-lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone.
Units of measure:
Stone (mass), a unit of mass which since the latter half of the twentieth century has been equal to fourteen pounds, i.e. 6.35 kilograms
Stone (Chinese weight), a Chinese unit of weight equal to 120 piculs
or 160 pounds.
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