Quartz
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Igneous (Host Environment) in the encyclopedia
View all →
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral
Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Quartz geode or quartz-bearing rock
Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chalcedony (Agate/Carnelian)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Quartz/Chalcedony concretion
sedimentary
Quartz Geode / Druzy Quartz Node
Silicon Dioxide (SiO2)
sedimentary
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rounded pebble with dark mineral inclusion
Likely granitic or volcanic pebble containing a mafic inclusion; exact identification requires testing
igneous
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz grains)
sedimentary
Oxidized iron-rich rock, possibly weathered basalt or ironstone
Likely ferruginous basalt or hematite/goethite-rich breccia; exact identification requires testing
igneous
Weathered iron-rich concretion or limonite-bearing rock
Limonite/goethite-rich concretion; limonite is an iron-oxide/hydroxide mixture, commonly dominated by goethite (FeO(OH))
sedimentary
Garnet
Garnet (X3Y2(SiO4)3)
mineral
Ruby (Raw Corundum)
Alumina (Al2O3) with Chromium traces
gemstone
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Small rounded light-colored mineral pebble
Indeterminate; possibly quartz, feldspar, or calcite
mineral
Rough amber-colored quartz or calcite fragment
Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing
mineral
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Druzy
Silicon Dioxide (SiO2)
sedimentary
Quartz vein in foliated metamorphic rock
Likely quartz-bearing schist or gneiss; visible crystal is quartz (SiO₂)
metamorphic
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Veined Siltstone or Graywacke
Clastic Sedimentary Rock with Quartz (SiO2) veining
sedimentary
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Quartz Geode (Partially Open)
Silicon Dioxide (SiO2) within Sedimentary Host Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic