Jasper pebble
Jasper (Silicon Dioxide, SiO2)
sedimentary
Category
Anthropogenic (Man Made Artifact)
Browse anthropogenic (man made artifact) specimens identified by the Rock Identifier community.
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Iron-Nickel Meteorite fragment
Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))
mineral
Granite (tumbled pebble)
Granite (Plutonic Igneous Rock)
Igneous Rock
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2 + Fe2O3)
sedimentary
Magnetite
Magnetite (Fe3O4)
Mineral
Limonite-pseudomorph after Pyrite (Prophecy Stone)
Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Larimar
Pectolite (a blue variety of Pectolite)
Mineral
Rugose Coral (Horn Coral)
Order Rugosa (extinct fossilized coral)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Basalt with Quartz Veins
Vesicular or aphanitic Basalt with SiO2 (Quartz) intrusions
Igneous
Pink Diamond
Carbon (C)
mineral
Jasper-Agate Breccia
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock
igneous
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Granodiorite (foreground) and Rose Quartz (background)
Granodiorite / Quartz (SiO2)
igneous
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Sandstone
Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)
Sedimentary Rock
Sandstone (Red Sandstone / River Stone)
Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)
sedimentary
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Fluorite (likely Fluorite on Quartz/Matrix)
Calcium Fluoride (CaF2)
mineral
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
mineral
Rainbow Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Red Hematite
Iron(III) oxide (Fe2O3)
mineral
Limestone
Calcium carbonate (CaCO3)
sedimentary
Fluorite
Fluoride (Calcium Fluoride - CaF2)
mineral
Red Jasper (Quartzite conglomerate)
Silicon dioxide (SiO2) with Iron inclusions
sedimentary
Limonite
Limonite (FeOO·nH2O)
mineral
Rose Quartz
Rose Quartz (Silicon Dioxide, SiO2)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Porphyritic Basalt (Chinese Flower Stone / Chrysanthemum Stone basalt variety)
Porphyritic Basalt containing Plagioclase Feldspar phenocrysts
igneous
Limestone (specifically Tufa or Travertine)
Calcium Carbonate (CaCO3)
sedimentary
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)
metamorphic
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Diabase (Greenstone)
Diabase or Dolerite
igneous