Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Category
Metamorphic Or Sedimentary Depending On Local Grade
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Serpentinite
Serpentinite (composed largely of Serpentine minerals such as Lizardite, Antigorite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Nephrite Jade
Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Unakite
Epidotized Granite
metamorphic
Nephrite Jade (River Bed Pebble)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Granitoid (Granite/Gneiss)
Granitoid silicate rock, primarily quartz and feldspar
igneous/metamorphic
Anthracite Coal
Anthracite (Carbon Content: 86%–98%)
metamorphic
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone (likely Quartzose Sandstone with mineral staining)
Arenite (composed mainly of SiO2)
sedimentary
Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)
Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein
sedimentary
Conglomerate
Conglomerate
sedimentary
Agate (translucent slice)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Serpentine, likely a variety of Chrysoprase (green chalcedony) or a similar translucent green mineral.
Serpentine Group Minerals (e.g., Antigorite, Lizardite) or Chalcedony (SiO2) with nickel impurities for Chrysoprase green.
mineral
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
mineral
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Ironstone Concretion (Nutstone)
Ironstone (with High Limonite/Hematite Content)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Silty Shale or Mudstone
Siltstone/Mudstone (Clastic Sedimentary Rock)
sedimentary
Travertine
Calcareous Tufa (CaCO3)
sedimentary
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Muscovite Mica (on Quartz Matrix)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Peach Moonstone
Anorthoclase or Orthoclase Feldspar (K,Na)AlSi3O8
mineral
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
sedimentary
Quartz (specifically Milky Quartz or Quartzite)
Silicon Dioxide (SiO2)
mineral
Jadeite (Jade)
Jadeite (NaAlSi2O6)
metamorphic
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Anthracite Coal
Anthracite
metamorphic
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary