Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Category
Mineral_rock
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Snowflake obsidian cabochon
Obsidian (volcanic glass), SiO₂-rich; white areas are cristobalite/spherulitic devitrification
igneous
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Magnetite (Loadstone candidate)
Iron(II,III) oxide (Fe3O4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
Mineral
Granite
Felsic intrusive igneous rock
igneous
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group: Chrysotile, Lizardite, and Antigorite)
metamorphic
Milky quartz pebble
Quartz (SiO₂), commonly called milky quartz
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Ruby (varieties of Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Picture Jasper
SiO2 (Microcrystalline Quartz / Chalcedony with iron oxide impurities)
sedimentary
Fossilized Shark Tooth
Fossilized elasmobranch tooth (Apatite/Calcium Phosphate)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
River Pebble
Quartzite / Weathered Sedimentary Rock
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic Plutonic Igneous Rock
igneous
Granite
Intrusive Felsic Igneous Rock
igneous
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Diamond
Native Carbon (C)
gemstone
Granite
Granite
Igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
sedimentary
Siltstone with Sandstone Bands
Siltstone (composed of Quartz and Clay minerals)
sedimentary
Amethyst
Quartz (SiO2)
gemstone
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Chalcopyrite on Quartz
CuFeS2 (Chalcopyrite) with SiO2 (Quartz)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet Group (e.g., Almandine Fe3Al2(SiO4)3)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
gemstone
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Siltstone / Fine Sandstone Pebble
Sedimentary Rock (Quartz, Feldspar, Clay Minerals)
sedimentary