Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mixed: Igneous And Sedimentary
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Chert (River Siltstone/Quartzite)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Brown Chalcedony (Agate/Jasper blend)
Silicon dioxide (SiO2)
sedimentary
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
sedimentary
Greenstone (Epidosite / Chlorite Schist)
Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) or Chlorite)
metamorphic
Sandstone (Arkose)
Arkose Sandstone (SiO2 with KAlSi3O8)
sedimentary
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz Crystal (specifically a small Clear Quartz point)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Carnelian
Carnelian Agate (Silica: SiO2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminum - CuAl6(PO4)4(OH)8·4H2O
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Yellow Agate
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Greenstone / Graywacke
Metagraywacke (Chlorite-grade schistose rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Agate Geode
Cryptocrystalline Quartz (SiO2)
mineral
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Carnelian
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Gneiss (Granitic Gneiss)
Gneiss (from German Gneis, related to 'spark')
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Fluorite (Rainbow Fluorite Point)
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Green Fluorite (Beaded)
Fluorite (Calcium Fluoride, CaF2)
mineral