Quartz

Dumortierite in Quartz

Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)

Likely smoky quartz fragment

Quartz, SiO₂ (smoky variety)

Likely rose quartz fragment

Quartz (SiO₂), likely pale rose quartz

Quartz-rich pebble, possibly vein quartz

Quartz (SiO₂), possibly with iron-oxide staining and minor inclusions

Rose Quartz

Silicon Dioxide with traces of Titanium, Iron, or Manganese (SiO2)

Gold-bearing quartz specimen

Native gold (Au) in quartz, possibly with iron sulfides

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (SiO2)

Quartzite (Milky)

Quartzite (SiO2)

Quartz (Yellow / Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Tumbled quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz-rich breccia or druzy quartz specimen

Microcrystalline to crystalline SiO₂, likely quartz/chalcedony with iron-oxide staining and possible host-rock fragments

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂); probable rose quartz

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂), likely rose quartz; possibly lab-created or treated

Milky quartz

Quartz (silicon dioxide, SiO₂)

Tumbled quartz-rich pebble, possibly smoky quartz or chert

Quartz (SiO₂), or microcrystalline quartz if chert

Quartz Pebble

Silicon Dioxide (SiO2)

Tourmalinated quartz

Quartz (SiO₂) containing black tourmaline, usually schorl (NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions

Citrine quartz crystal cluster

Quartz, SiO₂; likely iron-colored citrine, possibly heat-treated amethyst

Quartz-rich granitic rock (likely pegmatitic granite)

Granite/pegmatite; predominantly quartz (SiO₂), feldspar, and dark biotite or amphibole

Gold-bearing Quartz Ore

Auriferous Quartz (SiO2 with Au)

Quartz Vein in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

Geode

Quartz / Chalcedony nodule with mineralized cavity

Fuchsite in Quartz (Aventurine Quartz)

K(Al,Cr)2(AlSi3O10)(OH)2 (Fuchsite) + SiO2 (Quartz)

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Quartz with Mica/Schist inclusion

Silicon Dioxide (SiO2) with Phyllosilicates

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Small quartz-rich rock fragment (possibly weathered quartz vein material)

Quartz (SiO₂) in an undetermined host rock; the image is insufficient to identify the host confidently

Unidentified pale stone or mineral specimen

Indeterminate; possibly massive quartz, calcite, or a light-colored feldspathic rock

Quartz Vein in Amphibolite / Gneiss

Quartz (SiO2) in Mafic Metamorphic Host Rock

Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Rough Diamond (or Quartz Crystal)

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

Quartz with Mica (Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH,F)2)

Clear faceted quartz-like gemstone

Probably rock crystal quartz (SiO₂), though the image may show synthetic glass or cubic zirconia

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Tumbled rose quartz

Quartz (silicon dioxide, SiO₂), pink variety known as rose quartz

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Tumbled citrine quartz (probable)

Quartz, SiO₂; yellow coloration likely from iron impurities or heat treatment

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (silicon dioxide, SiO₂)

Quartz-rich vein fragment, possibly quartz with mica or calcite

Quartz (SiO₂), with probable muscovite/biotite mica and minor feldspar or calcite

Quartz vein in foliated metamorphic rock

Milky quartz (SiO₂) in likely schist or gneiss