Crystals
Diamond
Carbon mineral Chemical symbol C Isometric crystal system Mohs 10 Refractive index 2.417 Diamond: Carbon Lattice, Spectral Fire, and the Engineering of Light Diamond is carbon arranged in an exceptionally...
Diamond
Carbon mineral Chemical symbol C Isometric crystal system Mohs 10 Refractive index 2.417 Diamond: Carbon Lattice, Spectral Fire, and the Engineering of Light Diamond is carbon arranged in an exceptionally...
Granite
Felsic intrusive igneous rock Quartz + alkali feldspar + plagioclase Coarse interlocking crystals Commonly about 65–77% SiO2 Typical density about 2.6–2.75 g/cm³ Granite: The Crystalline Framework of Continents Granite is...
Granite
Felsic intrusive igneous rock Quartz + alkali feldspar + plagioclase Coarse interlocking crystals Commonly about 65–77% SiO2 Typical density about 2.6–2.75 g/cm³ Granite: The Crystalline Framework of Continents Granite is...
Girasol
Optical description, not one mineral species Common opal: SiO2·nH2O Quartz: SiO2 Diffuse blue-white internal glow Cabochons, spheres, beads, and freeforms Girasol: Two Silica Materials, One Floating Internal Light Girasol is...
Girasol
Optical description, not one mineral species Common opal: SiO2·nH2O Quartz: SiO2 Diffuse blue-white internal glow Cabochons, spheres, beads, and freeforms Girasol: Two Silica Materials, One Floating Internal Light Girasol is...
Fluorite
Calcium fluoride Chemical formula CaF2 Isometric crystal system Perfect octahedral cleavage Mohs hardness 4 Fluorite: Cubic Color, Octahedral Cleavage, and the Mineral Behind Fluorescence Fluorite is calcium fluoride arranged in...
Fluorite
Calcium fluoride Chemical formula CaF2 Isometric crystal system Perfect octahedral cleavage Mohs hardness 4 Fluorite: Cubic Color, Octahedral Cleavage, and the Mineral Behind Fluorescence Fluorite is calcium fluoride arranged in...
Fuchsite
Chromium-rich muscovite K(Al,Cr)2(AlSi3O10)(OH)2 Monoclinic sheet silicate Mohs approximately 2–3 Aventurine and ruby-bearing associations Fuchsite: Chromium-Green Mica, Layered Light, and the Sparkle Inside Aventurine Fuchsite is the green, chromium-bearing variety of...
Fuchsite
Chromium-rich muscovite K(Al,Cr)2(AlSi3O10)(OH)2 Monoclinic sheet silicate Mohs approximately 2–3 Aventurine and ruby-bearing associations Fuchsite: Chromium-Green Mica, Layered Light, and the Sparkle Inside Aventurine Fuchsite is the green, chromium-bearing variety of...
Charoite
Complex hydrated silicate Monoclinic Fibrous charoitite Mohs 5–6 Murun Massif, Siberia Charoite: Violet Fibers, Siberian Stone Rivers, and Silky Mineral Motion Charoite is a rare purple mineral best known through...
Charoite
Complex hydrated silicate Monoclinic Fibrous charoitite Mohs 5–6 Murun Massif, Siberia Charoite: Violet Fibers, Siberian Stone Rivers, and Silky Mineral Motion Charoite is a rare purple mineral best known through...