Mineral And Sedimentary

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Mixed Mineral and Rock Collection

Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Iron-stained quartz (likely quartzite or quartz-rich rock)

Quartz, silicon dioxide (SiO₂), with iron-oxide staining

Quartz in Matrix

Silicon Dioxide (SiO2)

Limonite

FeO(OH)·nH2O

Clear quartz fragment

Quartz (silicon dioxide, SiO₂)

Limonite

FeO(OH)·nH2O

Pyrite

Iron Sulfide (FeS2)

Small white quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz crystal fragment

Quartz (silicon dioxide, SiO₂)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Hematite

Iron (III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Quartz vein in weathered host rock

Quartz (SiO₂), likely in a weathered metamorphic or igneous matrix

Tumbled white quartz

Quartz (silicon dioxide, SiO₂)

Tumbled quartz (likely milky/clear quartz)

Quartz, silicon dioxide (SiO₂)

White quartz fragment

Quartz (silicon dioxide, SiO₂)

Specular Hematite

Iron(III) oxide (Fe2O3)

Tumbled quartz (likely rose or milky quartz)

Quartz, silicon dioxide (SiO₂)

Weathered quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Hematite

Iron (III) Oxide (Fe2O3)

Quartz fragment

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Peach/orange calcite cluster

Calcite (CaCO₃), likely botryoidal or scalenohedral aggregate

Blue-green calcite (likely aragonite or apatite alternative)

Calcite, CaCO₃

Hematite (likely Botryoidal or Specularite variant)

Iron(III) oxide (Fe2O3)

Calcite crystal cluster

Calcite, calcium carbonate (CaCO₃)

Pyrite

Iron Disulfide (FeS2)

Hematite

Ferric Oxide (Fe2O3)

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or iron-stained quartz

Hematite

Iron Oxide (Fe2O3)

Rough Diamond (or Quartz Crystal)

Carbon (C) [if Diamond] / Silicon Dioxide (SiO2) [if Quartz]

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Rounded quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly milky quartz or a pale quartzite fragment

Quartz crystal

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Clear quartz

Quartz (silicon dioxide, SiO₂)

Blue calcite (probable)

Calcite, calcium carbonate (CaCO₃)

Hematite

Iron Oxide (Fe2O3)

Tumbled quartz-rich stone, likely milky quartz

Quartz (SiO₂), possibly iron-stained milky quartz or quartzite

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)