Olivine (likely Peridot variety)
Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4
Mineral
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Ferruginous Sandstone (with Iron Oxide staining)
Clastic Sedimentary Rock - Quartz Arenite/Wacke
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with trace Fe2+)
mineral
Quartz (Smoky/Grey variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
White Marble (Industrial/Architectural)
Recrystallized Calcite (CaCO3)
metamorphic
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/8e928afb-bd26-4377-ab19-28fd017f7b9f-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
sedimentary
River Rock
Sedimentary Rock (various compositions)
sedimentary
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Diamond (in jewelry)
Carbon (C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Soapstone (Talc Schist)
Steatite
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Shale creek bed
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Rough Quartz (likely Rose or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Jasper (specifically Red Jasper or Iron-stained Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite
Quartzite
Metamorphic rock
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Gold Nugget
Native Gold (Au)
mineral
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz Geode (Cracked)
Silicon Dioxide (SiO2)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Quartz Pebble
Silicon dioxide (SiO2)
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Conglomerate
Conglomerative Sedimentary Rock
sedimentary
Sapphire
Corundum (Al₂O₃) with trace elements causing color variations.
Mineral
Crazy Lace Agate
Silicon dioxide (SiO2) - a variety of banded Chalcedony (cryptocrystalline quartz)
mineral
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Unidentifiable Specimen
Undetermined
Unknown