Quartz Vein in Host Rock (often Granite or Schist)
Silicon Dioxide (SiO2) within host matrix
mineral with metamorphic or igneous host
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River Chalcedony / Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Herkimer Diamond (Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Granite
Granite (Felsic intrusive igneous rock)
igneous
Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Rose Quartz
Silicon dioxide with traces of titanium, iron, or manganese (SiO2)
mineral
Basalt
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amphibolite (specifically Hornblende Schist/Gneiss)
Amphibole-rich Metamorphic Rock
metamorphic
Sandstone Concretion with Quartz Center
Sedimentary Clastic Rock (SiO2 matrix with Quartz core)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and K-feldspar)
igneous
Tiffany Stone
Fluorite Opal (a complex mix of Fluorite, Opal, Calcite, Dolomite, Quartz, and Bertrandite)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Amethyst (Tumbled)
Purple Quartz (SiO2 with iron impurities and irradiation)
mineral
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Sandstone
Arenite (often composed of Quartz, SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Indigo Gabbro
Gabbro (MaFIC intrusive rock)
igneous
Diorite (River Rock/Cobble)
Intermediate Plutonic Igneous Rock (Diorite)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Pink Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Dalmation Stone (Dalmation Jasper)
Peralkaline Rock with Feldspar and Arfvedsonite
igneous
Basalt
Aphanitic Mafic Igneous Rock
igneous
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Milky Quartz (among River Rock)
Quartz (Silicon Dioxide, SiO2)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
![Dragon Blood Jasper (Epidote with Pietersite or Red Jasper (Ca2Al2Fe3+[Si2O7][SiO4]O(OH))) — metamorphic](https://media.rockidentification.com/7ebd5bc2-2269-4b90-a9ec-309bf2d8a280-thumbnail.jpg)
Dragon Blood Jasper
Epidote with Pietersite or Red Jasper (Ca2Al2Fe3+[Si2O7][SiO4]O(OH))
metamorphic