Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Category
Sedimentary Or Mineral
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Mineral in the encyclopedia
View all →
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Sandstone (Yellow/Siltstone variant)
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Chalcedony (Common Opal or Agate)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Calcareous or Micaceous)
Clastic sedimentary rock (primarily Quartz with Cementing Agents)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite
sedimentary
Gneiss
Gneiss
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Limonite Boxwork / Iron Ore Concretion
FeO(OH)qnH2O (Hydrated iron oxide)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Coarse Sandstone Pebble
Clastic Sedimentary Rock (Sandstone)
sedimentary
Sandstone nugget
Arenite (primarily Quartz SiO2)
sedimentary
Sandstone (Micaceous)
Clastic Sedimentary Rock - Micaceous Litharenite (SiO2 principal)
sedimentary
Limonite (Ironstone)
Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))
mineral
Sandstone
Arenite (Sedimentary rock)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Geode (Unopened)
Crystalline Quartz or Chalcedony filled Geode (SiO2)
sedimentary
Gravel / Limestone Fragment
Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Fluorite
Calcium fluoride (CaF2)
mineral
Pyrite (Tumbled)
Iron Disulfide (FeS2)
mineral
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Exogyra or Gryphaea species)
fossil
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Selenite (Satin Spar)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Banded Agate (Silk Agate or Maligano Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Pyrite (Fool's Gold) Cube
Iron Sulfide (FeS2)
mineral