Igneous And Sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Small white quartz fragment

Quartz (silicon dioxide, SiO₂)

Tumbled quartz (likely milky or rose quartz)

Quartz, silicon dioxide (SiO₂)

Uncertain blue-white mineral fragment

Possibly calcite or quartz; identification is limited because the specimen is tiny and partly translucent

Yellow quartz fragment (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Multi-gemstone Quartz and Fluorite Bracelet

Silicon Dioxide (SiO2) and Calcium Fluoride (CaF2)

Likely tumbled quartz or calcite pebble

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Polished golden mineral specimen, likely golden calcite or citrine quartz

Identification uncertain from the photograph; possibilities include calcite (CaCO₃) or quartz (SiO₂), with the color potentially enhanced by polishing or coating

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz (clear quartz/crystal quartz)

Quartz, silicon dioxide (SiO₂), trigonal crystal system

Likely smoky quartz or quartz-rich tumbled fragment

Quartz, silicon dioxide (SiO₂), possibly smoky quartz

Quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Likely clear quartz crystal (possibly cut/polished quartz or glass imitation)

Quartz, silicon dioxide (SiO₂)

Dark metallic-looking mineral specimen, possibly magnetite

Magnetite (Fe₃O₄), tentative identification

Small quartz fragment (probable)

Quartz, SiO₂

Tumbled quartz (likely milky/rose quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Tumbled quartz (likely rose quartz or included quartz)

Quartz, silicon dioxide (SiO₂)

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Orange mineral fragment, possibly citrine or iron-stained quartz

Quartz (SiO₂), tentatively iron-included quartz/citrine

Quartz-rich rock or quartz specimen

Quartz (SiO₂), likely massive quartz or quartz-bearing host rock

Pyrite in Quartz Matrix

Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)

Probable magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Polished magnetite-rich ironstone (possible magnetite pebble)

Magnetite, Fe₃O₄; possibly magnetite-bearing basalt or ironstone

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Likely milky quartz

Quartz (silicon dioxide, SiO₂)

Magnetite / Ironstone

Magnetite (Fe3O4)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Apatite

Fluorapatite (Ca5(PO4)3F)

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Quartz

Silicon dioxide (SiO2)

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Magnetite

Iron(II,III) oxide (Fe3O4)