Serpentine
Serpentine-group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Category
Metamorphic Or Sedimentary Depending On Local Grade
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Orthoclase Feldspar
Potassium aluminum silicate (KAlSi3O8)
mineral
Quartz (pebble)
Quartz (SiO₂)
Mineral
Grey Quartzite Pebble
Quartzite (primarily SiO2 - Silicon Dioxide)
metamorphic
Green Aventurine
Silicon Dioxide (Quartz) with inclusions (SiO₂)
Mineral
Black Tourmaline (Schorl)
NaFe3Al6(BO3)3Si6O18(OH)4
Mineral
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Tourmaline (Schorl or Dravite) on Matrix
Complex Borosilicate - Na(Mg,Fe,Li,Al,Mn)3Al6(BO3)3Si6O18(OH,F)4
mineral
Quartz with Mica (Schist/Pegmatite fragment)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
igneous/metamorphic
Common Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine-group minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Diamond
Diamond (C)
mineral
Diamond (Faceted Gemstone)
Native Carbon (C)
mineral
Diamond
Native Carbon (C)
mineral
Raw Diamond
Diamond (pure Carbon, C)
mineral
Amazonite (with smoky quartz/red jasper inclusions)
Tectosilicate - Microcline Feldspar (KAlSi3O8)
Mineral
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Lapis Lazuli
Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Milky Quartz
Quartz (SiO2)
Mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
Mineral
Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)
Calcite
Mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Quartz with Chlorite or Hornblende inclusions
Silicon dioxide (SiO2) with phyllosilicate or amphibole inclusions
metamorphic
Quartzite with Chlorite
Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)
metamorphic
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Slate
Foliated Metamorphic Rock (composed mainly of Quartz, Illite, and Chlorite)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
mineral
Rainbow Moonstone with Black Tourmaline
White Labradorite with Schorl (Na,Ca)(Al,Si)4O8
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Quartzite (Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Botryoidal Lace Agate
Agate (Silicon Dioxide, SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Amber
Fossilized tree resin
gemstone
Lapis Lazuli
Na6Ca2(Al6Si6O24)(S,SO4,Cl)1-2 (primarily containing Lazurite with inclusions of Calcite and Pyrite)
metamorphic
Greenstone with Magnetite Veins
Metabasalt (Greenstone)
metamorphic
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
sedimentary
Coquina or Coral Fossil
Biogenic Limestone (Calcite/Aragonite)
sedimentary