Amygdaloidal Basalt
Amygdaloidal Basalt (Host rock) with Quartz or Calcite amygdules
igneous
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
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Quartzite
Quartzite (SiO2)
metamorphic
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Quartzite pebble
Quartzite (SiO2 with trace iron/feldspar)
metamorphic
Quartzite pebble
Quartzite (SiO2 with iron oxide staining)
metamorphic
Quartzite Pebble (River Pebble)
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Ruby in Quartz with Tourmaline
Corundum (Al2O3) in Silicon Dioxide (SiO2) with Schorl
metamorphic
Quartzite pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite (River Stone)
Metamorphic Quartz (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite Nodules / Weathered Pyrite
Iron Sulfide (FeS2)
mineral
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Banded Sandstone (Liesegang Rings)
Arenite with Liesegang rings (SiO2/Fe2O3)
sedimentary
Siderite Concretion in Shale
Iron carbonate (FeCO3) in Mudstone/Shale matrix
sedimentary
Geode (Small unopened nodule)
Quartz-lined nodule (SiO2)
sedimentary
Orange Calcite
Calcite (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Calcite on Matrix
Calcium Carbonate (CaCO3)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint or Jasper if reddish)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Quartz Geode
Quartz (SiO2) in a Sedimentary Vug
sedimentary
Quartz (Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Quartz (Microcrystalline Fragment)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Limonite (often after Hematite or Goethite)
Limonite (FeO(OH)·nH2O)
mineral
Blue Quartz (Dumortierite Quartz)
Silicon Dioxide (SiO2) with Dumortierite inclusions (Al7BO3(SiO4)3O3)
mineral
Pyrite
Iron sulfide (FeS2)
mineral