Mineral With Metamorphic Or Igneous Host

Chert (Septarian or Banded Nodular Variety)

Microcrystalline Quartz (SiO2)

Potassium Feldspar (Orthoclase)

KAlSi3O8

Epidote in Matrix (Dragon Stone variant)

Epidote with Quartz/Feldspar (Ca2(Al,Fe)3(SiO4)3(OH))

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Citrine

Silicon dioxide (SiO2)

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Fluorite (Green Fluorite on Host Rock)

Fluorite (Calcium Fluoride, CaF2)

Gold Nugget

Native Gold (Au)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Quartz Geode

Quartz (Silicon Dioxide, SiO2) in a Geode

Chrysocolla on Quartz with Iron Oxides

Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Sandstone Concretion

Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)

Druzy Quartz Geode (Vug)

Silicon Dioxide (SiO2)

Granite (with Almandine Garnet inclusions)

Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)

Turquoise

Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Yellow Quartz (Citrine or Quartzite Pebble)

Silicon Dioxide (SiO2)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Diamond

Native Carbon (C)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Greenschist (Greenstone River Pebble)

Greenschist (Chlorite Schist)

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)

Soapstone

Steatite (composed primarily of Talc, Mg3Si4O10(OH)2)

Emerald (Beryl)

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Quartz pebble with host matrix

Silicon Dioxide (SiO2)

Corundum (variety Ruby/Sapphire)

Aluminum Oxide (Al2O3)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Epidosite (Unakite-related)

Epidosite (predominantly Epidote, Ca2(Al2,Fe3+)(SiO4)3(OH))

Fluorite

Calcium Fluoride (CaF2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Copper Ore with Malachite and Chrysocolla

Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

Ironstone Concretion (Coprolite-like)

Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) Infilling