Rough Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Category
Metamorphic (Low Grade)
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Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Black Diamond / Black Sapphire
Carbon (C) or Corundum (Al2O3)
mineral
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Sunstone
Plagioclase feldspar (with Copper or Hematite inclusions)
mineral
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Specular Hematite
Hematite (Fe2O3)
mineral
Orthoclase Feldspar (Salmon variety)
Orthoclase, KAlSi3O8
mineral
Serpentine with Quartz Vein
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4 with SiO2 veins
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineral
Dyed Magnesite (Howlite imitation)
Magnesium carbonate (MgCO3) with dye
mineral
Gneiss
Gneiss
metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Black Sand (Magnetite Sand)
Magnetite (Fe3O4)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)
metamorphic
Yellow Sapphire
Corundum (Al2O3) with iron impurities
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz with Schist Matrix
Crystalline Silicon Dioxide (SiO2) in micaceous schist
metamorphic
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic
Sapphire
Corundum (Al2O3)
mineral
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
mineral
Green Tourmaline
Elbaite - Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4
mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
Mineral
Mica Schist
Schist (muscovite-biotite rich)
metamorphic
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
White Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Jasper and Epidote (Unakite-like specimen)
Epidotized granite or Jasper with Epidote inclusions
metamorphic
Pink Granite / Gneiss
Felsic Plutonic Rock (Granite) with Gneissic banding
igneous / metamorphic
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Lapis Lazuli with Pyrite
Lapis lazuli (Mainly Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic