Quartz

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (mostly SiO2)

Pegmatite with Quartz and Muscovite Mica

Granitic Pegmatite (KAl2(AlSi3O10)(OH)2 + SiO2)

Slate with Quartz

Low-grade Metamorphic Slate with SiO2 inclusions

Milky Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Disulfide (FeS2)

Colorless faceted quartz-like gemstone

Likely quartz (SiO₂), though the appearance may also indicate man-made glass or cubic zirconia

Quartz vein in dark metamorphic rock

Likely quartz-rich vein cutting a biotite- or amphibole-rich metamorphic host; exact host rock cannot be confirmed from the image

Polished pink quartz cabochon

Quartz (SiO₂), likely rose quartz or included quartz

Orange Quartz (Ferruginous Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Quartz with inclusions

SiO2

Likely tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz-rich gold-brown mineral specimen, possibly iron-stained quartz

Quartz (SiO₂), likely with limonite/goethite staining and minor sulfide or mica inclusions

Iron-stained quartz or chert fragment

Quartz (SiO₂), possibly microcrystalline quartz/chert with limonite staining

Milky quartz fragments

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

White quartz geode

Quartz, silicon dioxide (SiO₂), likely a druzy quartz geode

Faceted yellow gemstone, likely citrine

Quartz (SiO₂); identification is uncertain from the image alone

Tumbled quartz-rich pebble, possibly rose quartz or quartzite

Quartz (SiO₂), potentially quartzite if composed of fused quartz grains

Brown translucent mineral fragment, possibly iron-stained quartz or amber

Uncertain; likely quartz (SiO₂) with iron-oxide staining, though amber (fossilized resin) is possible

Faceted colorless gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂), though the strong glare and visible facet pattern could indicate cubic zirconia or lead glass

Iron-stained quartz or quartzite pebble

Quartz (SiO₂), possibly quartzite with hematite/goethite staining

Pink Quartz / Rose Quartz

Silicon Dioxide (SiO2)

Iron-stained quartz pebble

Quartz (SiO₂), with iron-oxide staining; exact variety uncertain

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions/staining (Limonite/Hematite)

Tumbled pink quartz or rose quartz

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

Carved quartz skull, likely smoky quartz or gray chalcedony

Silicon dioxide (SiO₂), quartz or microcrystalline quartz

Quartz (likely a clear or rock crystal variety)

Quartz (SiO2 - Silicon Dioxide)

Rounded, foliated metamorphic pebble (likely schist)

Mica schist, composition uncertain from the image

Quartz-rich sandstone or quartzite

Quartz (SiO₂)-rich clastic rock; possibly weakly metamorphosed quartzite

Quartz–feldspar mica-bearing metamorphic rock, likely gneiss or schist

Micaceous quartzofeldspathic gneiss/schist; chiefly quartz (SiO₂), feldspar, and biotite/muscovite mica

Quartz-rich pegmatite with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and muscovite/biotite mica, with possible sulfide or iron-oxide staining

Biotite schist with quartz veins

Quartz–mica schist; primarily quartz (SiO₂), biotite mica, and feldspar

Biotite-rich schist (mica schist)

Mica schist, chiefly quartz + biotite mica; possibly feldspar and minor sulfides

Polished blue-green agate slice

Agate, a banded microcrystalline variety of chalcedony (SiO₂), commonly colored by trace minerals

Quartz-rich pegmatite (weathered feldspar–quartz rock)

Granitic pegmatite; primarily quartz (SiO₂), feldspar, and minor biotite/iron-oxide minerals

Vein Quartz in Basalt or Chert

Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)

Tourmaline in Quartz Matrix

Complex silicate of boron and aluminum (Schorl/Elbaite/Dravite) - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Quartz with Chalcopyrite

Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)