Chert Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossil Shark Tooth
Selachimorpha (Chondrichthyes dental fossil)
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Limestone (specifically Carboniferous Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Granite or Pegmatite with Mica
Granitoid
igneous
Fancy Jasper (Agate/Chert mix)
Silicon Dioxide (SiO2) with impurities
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartz (Iron-stained or Ferruginous Quartz)
Silicon Dioxide (SiO2)
mineral
Honey Calcite Geode Segment
Calcite (Calcium Carbonate, CaCO3)
mineral
Muscovite Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz (Smoky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Septarian (Dragon Stone)
Septarian Nodule (Aragonite, Calcite, Limestone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Amazonite with Smoky Quartz and Feldspar
Microcline (KAlSi3O8) with Quartz (SiO2)
mineral
Purple Dyed Agate Geode (Banded Chalcedony)
Silicon Dioxide (SiO2) - variety: Agate
mineral
Amethyst (Scepter/Double Terminated Point)
Silicon Dioxide (SiO2)
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
Mineral
Quartz (Citrine or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Granite (Alkali Feldspar Granite)
igneous
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)
sedimentary
Smoky Quartz (Ferruginous Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite with Opal infusion
FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)
mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Basalt (Vesicular/Amygdaloidal or Water-Worn)
Basalt
igneous
Yellow Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Coral Fossil (Favosites)
Favosites (Extinct genus of tabulate corals)
sedimentary
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Quartzite cobblestone
Quartzite (primarily SiO2)
metamorphic
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
SiO2 (Silicon Dioxide)
metamorphic