Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Category
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Botryoidal quartz (likely chalcedony or druzy quartz)
Silicon dioxide, SiO₂; microcrystalline quartz (chalcedony) with possible drusy quartz coating
mineral
River Pebble
Lithified clastic sediment
sedimentary
Pebble with Basaltic and Quartz-rich Banding
Polymictic Lithic Pebble
sedimentary
Quartz (likely heat-treated or colored cord)
Silicon Dioxide (SiO2)
mineral
Chert Pebble (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Schist
Mica Schist
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Botryoidal Hematite
Iron(III) oxide (Fe2O3)
mineral
Schist with Biotite and Quartz
Biotite-Quartz Schist (Fe,Mg,Al silicate mix)
metamorphic
Felted Quartz / Chlorite Quartz
Chlorite included Quartz (SiO2 + (Mg,Fe)3(Si,Al)2O5(OH)4)
mineral
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions
metamorphic
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Copper Ore (with Malachite/Chrysocolla and Iron Oxides)
Secondary Copper Minerals (Cu2(CO3)(OH)2 / (Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Dalmatian Stone
Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite
igneous
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide (FeO(OH)·nH2O)
sedimentary
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Limonite (Iron Stone/Gossen)
Limonite (FeO(OH)·nH2O)
mineral
Schist
Crystalline Schist (often containing Muscovite, Biotte, or Quartz)
metamorphic
Gneiss
Gneiss
metamorphic
Geode
Quartz / Chalcedony nodule with mineralized cavity
sedimentary
Vesicular Basalt
Mafic Volcanic Rock (Basalt)
igneous
Sandstone Concretion
Carbonate-cemented Sandstone Concretion
sedimentary
Mica (Muscovite or Biotite)
Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Silver
Ag (Native Silver)
mineral
Inclusion Quartz (Garden Quartz)
Silicon Dioxide (SiO2) with inclusions (e.g., Chlorite, Hematite)
mineral
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Azurite with Malachite
Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
mineral
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral