Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Category
Sedimentary Or Mineral
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Sedimentary Pebble (Sandstone)
Clastic Sedimentary Rock (SiO2 dominant)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Satin Spar (often marketed as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide with inclusions (SiO2)
mineral
Pyrite and Quartz Agglomerate
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Limonite Concretion
Limonite (Hydrated iron oxide) FeO(OH)·nH2O
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Shale
Argillaceous Sedimentary Rock
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
sedimentary
Sandstone (likely Siltstone or fine-grained Sandstone)
Sedimentary Rock (Clastic)
sedimentary
River Cobble (likely Siltstone or Sandstone)
Clastic Sedimentary Rock
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Sandstone (with vugs)
Arenite / Sedimentary Sandstone
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone with Manganese Oxide Patina
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Sandstone (Quartz-rich)
Arenite
sedimentary
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Sandstone
Arenite
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
Mineral
Shale with Iron Staining
Fissile Argillaceous Sedimentary Rock
sedimentary
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
sedimentary
Limonite (Ochreous Sandstone)
Hydrous ferric oxides (FeO(OH)qnH2O)
sedimentary
Banded Gneiss
Gneiss
metamorphic
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral