Chemical Composition A family of complex aluminosilicates
Color A wide range of colors.
Refractive Index R.I. 1.52-1.54.
Durability Hardness 6-6.5.
Crystal Structure Monoclinic or triclinic
Specific Gravity 2.54-2.63.
Sources / Occurrence Many widely scattered locales, depending on composition.
Varieties Moonstone- colorless to yellowish gray, highly translucent to semitransparent variety

Amazonite- opaque light green to blue-green feldspar with a distinctive mottled or striated appearance.

Labradorite- gray or colorless to yellow feldspar containing inclusions of other materials that produce a variety of visual effects. Oregon produces semitransparent to transparent red to green (or bicolored) material (sunstone , heliolite, or plushstone).

Brilliantly iridescent blue/purple/yellow/green material from Finland is known as spectrolite.

Orthoclase- transparent yellow feldspar resembling  citrine quartz or yellow beryl.

Moonstone

Moonstone comes in colorless, white, yellow, orange, and gray. It always has a white or blue sheen. That is, moonstone reflects light in a distinctive shimmering phenomenon known as adularescence.

In India, moonstone is regarded as a sacred stone. It is believed to bring good fortune. Legend says that Moonstone is a highly prized gift for lovers as it arouses tender passion.
Moonstone is the US State gemstone of Florida and New York.

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