Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Igneous (Host Environment)
Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.
Pyrulite (Pyrite / Chalcopyrite)
Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)
mineral
Grey Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Orange Quartzite / Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
igneous
Herkimer Diamond
Double-Terminated Quartz (SiO2)
mineral
Banded Agate Geode
Silicon Dioxide (SiO2)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Dendritic Agate
Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)
Mineral
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Clear Quartz Crystal (Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Carnelian Agate color)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz (Quartz with Hematite inclusions)
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone or Mudstone
Sedimentary Rock (Sandstone/Mudstone)
sedimentary
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Jade
Jadeite or Nephrite (both are commonly referred to as 'jade'). Jadeite: NaAlSi2O6; Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2.
Mineral
Quartz (Chatoyant or Milky variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite river pebble
Recrystallized Quartz (SiO2)
metamorphic
Yellow Quartzite (River Pebble)
Quartzite (mainly SiO2 with iron oxide impurities)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Sandstone (SiO2)
metamorphic
Milk Quartz (with Iron staining)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Iron-stained Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
mineral