Igneous, Sedimentary, Metamorphic, And Mineral

Calcite

Calcium Carbonate (CaCO3)

Orange Quartz / Peach Aventurine

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Iron(II,III) oxide, Fe3O4)

Likely banded gneiss

Gneiss, a foliated metamorphic rock composed chiefly of quartz, feldspar, and mica

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Quartz crystals on matrix

Silicon dioxide (SiO2)

Hematite

Iron (III) Oxide (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Green Calcite

Calcium Carbonate (CaCO3)

Pyrite in Quartzite/Graphite Matrix

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Magnetite

Iron(II,III) oxide (Fe3O4)

Gneiss

Metamorphic Gneiss

Pyrite

Iron Sulfide (FeS2)

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Polished Hematite Tower

Hematite (Fe2O3)

Quartz pebble with iron staining

Silicon dioxide (SiO2) with iron oxide impurities

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Orange Calcite

Calcium Carbonate (CaCO3)

White Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Yellow variety)

Silicon Dioxide (SiO2)

Quartz geode or quartz-bearing rock

Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity

Tumbled quartz pebble, possibly citrine or pale smoky quartz

Quartz (SiO₂), likely microcrystalline/tumbled material

Quartz

Silicon Dioxide (SiO2)

Magnetite / Ironstone

Iron(II,III) oxide (Fe3O4)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Magnetite

Magnetite (Fe3O4)

Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Metamorphic Gneiss