Metamorphic, Likely Sedimentary With Quartz Veins

Likely polished quartz-bearing pebble or mineral fragment

Unidentified quartz-rich aggregate; possibly quartzite or an agate/chalcedony fragment

Greenish quartz (likely prase/chalcedony)

Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz

Quartz-veined weathered host rock

Quartz (SiO₂) in a likely altered limestone or metamorphic carbonate host

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Dark gray veined metamorphic rock

Likely marble or quartzite; exact identification requires hardness and acid tests

Milky quartz (possible pale green quartz)

Quartz, silicon dioxide (SiO₂)

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Quartz with Iron Inclusions

SiO2

Quartz-rich metamorphic rock, likely quartzite or vein quartz

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica and feldspar

Polished iron-stained quartz/quartzite

Quartz (SiO₂), likely quartzite or massive vein quartz with iron-oxide staining

Quartz

Silicon Dioxide (SiO2)

Banded gneiss

Foliated gneiss, likely quartz–feldspar–mica gneiss

Milky quartz (rough quartz fragment)

Quartz, SiO₂

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)

Quartz, SiO₂, in an unidentified dark silicate matrix

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Weathered quartz-rich rock, possibly quartzite or quartz vein fragment

Quartzite (mostly microcrystalline SiO₂), identification uncertain from image

Milky Quartz

Silicon Dioxide (SiO2)

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly in a weathered granitoid or metamorphic matrix

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂)

Quartz-rich rock, likely quartzite or milky quartz

Quartz (SiO₂); probable quartzite if the grains are interlocked

Quartz-rich rock, possibly milky quartz

Quartz (silicon dioxide, SiO₂), possibly with feldspar or mica inclusions

Gold

Gold (Au)

Quartz Pebble

Silicon Dioxide (SiO2)

Honey calcite (likely cleavage fragment)

Calcite, calcium carbonate (CaCO₃)

Pyrite (iron pyrite)

Pyrite, FeS₂

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert / Jasper

Silicon Dioxide (SiO2)

Quartz-bearing metamorphic rock, likely mica schist

Mica schist with quartz; commonly muscovite/biotite mica and SiO₂ quartz

Labradorite-bearing gneiss or altered feldspathic rock

Plagioclase-rich gneiss, locally labradorescent; composition likely plagioclase feldspar, quartz, mica, and iron-oxide veining

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Tumbled brown feldspar-rich rock, possibly tiger’s-eye or brecciated quartz

Indeterminate from image; likely quartz (SiO₂) with iron-stained feldspar or amphibole

Likely raw quartz-bearing stone, possibly greenish quartz or calcite

Uncertain from photograph; possible quartz (SiO₂) or calcite (CaCO₃)

Tumbled quartz-like pebble

Quartz (silicon dioxide, SiO₂), possibly iron-stained chalcedony

Small rounded quartz pebble

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

Mica-rich schist

Mica schist, likely muscovite–biotite schist with quartz

Quartz vein rock, likely iron-stained quartzite or hydrothermal quartz

Mostly quartz (SiO₂), with iron oxides and minor feldspar or mica

Tumbled Clear Quartz

Silicon Dioxide (SiO2)