Metamorphic, Likely Sedimentary With Quartz Veins

Quartzite (with mineral vein)

Metamorphosed Quartz-rich Sandstone (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz (Pink / Rose Quartz variant)

Silicon Dioxide (SiO2)

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂), likely massive milky quartz

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO₂)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Iron-stained quartz vein rock

Milky quartz (SiO₂) with limonite/goethite iron oxides, possibly in altered host rock

Weathered quartz-rich pebble (likely milky quartz or quartzite)

Quartz, silicon dioxide (SiO₂); possibly quartzite, a metamorphic quartz rock

Milky Quartz with inclusions

Silicon Dioxide (SiO2)

Quartz

SiO2 (Silicon Dioxide)

Iron-Stained Quartzite

Recrystallized Meta-Quartzite (primarily SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded gneiss

Gneiss, likely biotite–quartz–feldspar gneiss

Gneiss

Gneiss

Citrine Quartz (likely heat-treated)

Silicon Dioxide (SiO2)

Rounded granitic gneiss pebble

Felsic orthogneiss, composed mainly of quartz, feldspar, and mica

Green Quartz (including Prase or Aventurine variants)

Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (with Iron Oxide staining)

Quartz (Silicon Dioxide - SiO2)

Galena with Pyrite

Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Quartz (in a rock matrix)

Quartz (SiO2)

Quartz (Smoky/Milky)

Silicon Dioxide (SiO2)

Quartz (Chalcedony)

Silicon Dioxide (SiO2)

Likely citrine pendant

Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂), typically massive rose quartz colored by trace elements and microscopic inclusions

Milky quartz (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Likely milky quartz with iron-oxide inclusions

Quartz, silicon dioxide (SiO₂)

Milky Quartz (or Iron-Stained Quartz)

Quartz (Silicon Dioxide, SiO2)

Quartz-rich rock fragment, possibly granite or quartzite

Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining

Milky Quartz

Silicon Dioxide (SiO2)

Pale green translucent mineral fragment, likely calcite

Calcite (CaCO₃), tentatively; possibly green fluorite or prehnite

Quartz (Grain)

Silicon Dioxide (SiO2)

White calcite (likely tumbled calcite or marble fragment)

Calcite, calcium carbonate (CaCO₃); if the specimen is granular and rock-like, it may be marble, a calcite-rich metamorphic rock

Blue quartz-like mineral specimen

Likely quartz (SiO₂), possibly dyed or coated; exact identification requires testing