Crystals
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...
Citrine
Quartz family Yellow to orange quartz SiO2 Mohs 7 Trigonal crystal system Citrine: Golden Quartz of Warmth, Clarity, and Radiant Structure Citrine is the yellow-to-orange variety of quartz, valued for...
Citrine
Quartz family Yellow to orange quartz SiO2 Mohs 7 Trigonal crystal system Citrine: Golden Quartz of Warmth, Clarity, and Radiant Structure Citrine is the yellow-to-orange variety of quartz, valued for...
Aquamarine
Blue to blue-green beryl Be3Al2Si6O18 Hexagonal crystal system Mohs 7.5–8 Iron-colored silicate March birthstone Aquamarine: Sea-Blue Beryl, Hexagonal Light, and the Clarity of Pegmatite Crystals Aquamarine is the blue to...
Aquamarine
Blue to blue-green beryl Be3Al2Si6O18 Hexagonal crystal system Mohs 7.5–8 Iron-colored silicate March birthstone Aquamarine: Sea-Blue Beryl, Hexagonal Light, and the Clarity of Pegmatite Crystals Aquamarine is the blue to...
Fossil
Body, trace, microfossil, and chemical evidence Taphonomy and deep time Most common in sedimentary rock Mineral replacement, impressions, and original material Fossils: How Life Becomes Evidence and Deep Time Becomes...
Fossil
Body, trace, microfossil, and chemical evidence Taphonomy and deep time Most common in sedimentary rock Mineral replacement, impressions, and original material Fossils: How Life Becomes Evidence and Deep Time Becomes...
K2
Azurite-bearing granitic rock Quartz, feldspars, and mica Azurite: Cu3(CO3)2(OH)2 Malachite: Cu2CO3(OH)2 Composite hardness: approximately 3.5–7 Khaplu area, Gilgit-Baltistan, Pakistan K2 Stone: Azurite Orbs in Pale Granite and the Geology Behind...
K2
Azurite-bearing granitic rock Quartz, feldspars, and mica Azurite: Cu3(CO3)2(OH)2 Malachite: Cu2CO3(OH)2 Composite hardness: approximately 3.5–7 Khaplu area, Gilgit-Baltistan, Pakistan K2 Stone: Azurite Orbs in Pale Granite and the Geology Behind...