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quartz crystal

Beryl var. Aquamarine with Heliodor tip.

Sand Struck By Lightning At 1900 Degree Celsius-It's called a Fulgurite

Natural diamond crystals - Botswana, Africa.

Smithsonite - Kelly Mine, Magdalena, Socorro County, New Mexico mw

"hummingbird” inclusion

Fluorite - Tennessee

Rare paragenesis Rhodochrosite with amethyst

Sri Lanka Sapphire • Design in Gemstone with Style by Jeffrey Hunt

Azurite and Malachite, France

reverse trapiche (six-pointed radial pattern) Emerald

Queensland Boulder Opal

Tube agate

Lake Lahontan Nevada Agate

Rare paragenesis Rhodochrosite with amethyst

Mineralienatlas Lexikon - Mineralienportrait / Rhodochrosit

Rutile sprays on Hematite

Cacoxenite in quartz

The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and is one of several definitions of hardness in materials science.

Tiny Dioptase crystals on euhedral Calcite

Tsavorite from Merelani Hills, Lelatema Mtns., Arusha Region, Tanzania mw

Eudialyte was discovered in 1819 in the Julianehaab district of Greenland. It occurs in distinctive colors of a red-violet, pink, blue, yellow and brown.

Boulder Opal rough