Chert (Yellow or Tan variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral (Specifically A Variety Of Quartz)
Browse mineral (specifically a variety of quartz) specimens identified by the Rock Identifier community.
Chert (Chalky/Gray Variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (or Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Quartz with Iron Oxide Inclusions
SiO2 with Fe2O3 impurities
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)
sedimentary
Fossil Coral
Scleractinia (fossilized calcium carbonate)
sedimentary
Basalt (Drill Core)
Mafic Volcanic Rock (Basalt)
igneous
Porphyritic Basalt or Diabase with Plagioclase Phenocrysts
Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar
Igneous
Carnelian
Carnelian (a variety of Chalcedony); SiO2 (Silicon Dioxide)
mineral
Carnelian
Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Beach Pebble (Chert/Quartzite)
Microcrystalline Quartz (SiO2)
sedimentary
Milky and Citrine-type Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Banded Jasper with Hematite or Quartz
Silicon Dioxide (SiO2) with impurities
sedimentary
Jade (likely Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Red Jasper (Banded Jasper)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Puddingstone (Gowganda)
Jasper-clast Polymictic Conglomerate (Gowganda Formation)
sedimentary
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Chert (with Desert Varnish/Iron Stain)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon dioxide (SiO2)
sedimentary
Red Jasper
Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Carnelian Agate
Carnelian (Silicon Dioxide: SiO2)
mineral
Chert (with Quartz veins)
Microcrystalline quartz (SiO2)
sedimentary
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Blue Quartz (Dumortierite Quartz)
Silicon Dioxide with Aluminum Borosilicate (SiO2 + AlAl6BSi3O18)
metamorphic
Conglomerate
Conglomerate (SiO2 dominant in clasts)
sedimentary
Basalt River Pebble
Aphanitic Mafic Basalt
igneous
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Rose Quartz (SiO₂)
Mineral
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment
mineral
Bloodstone / Heliotrope
Silicon dioxide (SiO2) with inclusions
Mineral (variety of Chalcedony)