Quartz Pebble
Silicon Dioxide (SiO2)
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.
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Chert (Jasper variety)
Cryptocrystalline quartz (SiO2)
sedimentary
Pink Sapphire
Corundum (Al2O3 with trace Chromium and Iron)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity
mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Quartzite River Rock (with Limonite staining)
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock type)
sedimentary
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Jade
There are two distinct minerals commonly known as Jade: Nephrite (a calcium magnesium silicate - Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (a sodium aluminum silicate - NaAlSi2O6). Based on the image showing a typically softer, more fibrous appearance, it is likely Nephrite.
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Geode (Unopened)
Silica-lined Vug (primarily SiO2)
sedimentary
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Agate Geode
Chalcedony (cryptocrystalline SiO2)
mineral
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Fluorite in Matrix
Fluorite (CaF2) within a host rock matrix
Mineral
Chert (specifically Jasper/Brown Chert)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Pearl
Calcium Carbonate (CaCO3) - mainly Aragonite and Calcite
mineral
Quartz (Milky/Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Mineral
Travertine
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Banded Chert or Agate
Silicon Dioxide (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral