Moonstone

Moonstone properties at a glance

Geology & background

Forms in igneous and metamorphic rocks. The adularescence effect comes from alternating layers of orthoclase and albite.

Sacred in India for thousands of years, moonstone is traditionally given as a gift for the 13th wedding anniversary.

How to identify Moonstone

• Check whether the specimen's color and texture match typical Moonstone examples.
• Photograph a fresh surface in natural light and avoid shadows, glare, or wet surfaces.
• Use hardness, streak, luster, grain size, and locality together; no single trait is enough for every specimen.

Where Moonstone is found

Moonstone is reported from multiple localities or geological settings. Exact locality should be verified from specimen provenance, maps, or field notes.

How much is Moonstone worth?

Value depends on size, condition, color, crystal quality, locality, rarity, preparation, and provenance. Treat this as educational guidance, not an appraisal.

Common uses

• Jewelry
• Decorative objects

Interesting facts

• Ancient Romans believed it was formed from solidified moonlight
• The finest moonstones come from Sri Lanka
• Named Florida's state gem for the Apollo moon landings

Care & safety

Treat Moonstone as a collector specimen unless hardness, cleavage, and fracture are confirmed.

Avoid inhaling dust. Do not cut, grind, or polish unknown specimens without eye protection and a properly rated respirator.

Related rocks & minerals

Feldspar Feldspar Group Quartz Quartz Family Labradorite Minerals Aquamarine Semi-Precious Stones Garnet Semi-Precious Stones Iolite Semi-Precious Stones