Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sodalite
Chloric sodium aluminum silicate (Na8(Al6Si6O24)Cl2)
mineral
Greenschist
Greenschist facies rock
Metamorphic
Magnetic Hematite
Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)
Mineral
Diamond
Diamond (pure carbon, C)
mineral
Eudialyte
Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Fluorite (likely)
Calcium Fluoride (CaF2)
Mineral
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)
igneous
Limonite (Iron Ore)
Limonite (an FeO(OH)·nH2O mineraloid, not a true mineral due to variable composition)
Mineral
Unidentified Rock Fragment
Unknown
Rock
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Ametrine
Ametrine (SiO2 - Silicon Dioxide with varied iron impurities)
mineral
Greenstone
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Granite
Granite (Phaneritic Igneous Rock)
igneous
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Carnelian (a variety of Chalcedony)
SiO2 (Silicon Dioxide) with Iron Oxide impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Garnet (likely Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Serpentine
Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)
metamorphic
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Mineral, potentially a rock with chalcedony/jasper.
Chert Pebble (Jasperoid/Flint)
Silicon Dioxide (SiO2) - cryptocrystalline quartz
Sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
Mineral
Chert (Jasper variety)
Microcrystalline quartz (SiO2)
sedimentary
Conglomerate
Conglomerate Rock (Paraconglomerate)
sedimentary
Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Chert (and Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Anthracite
Anthracite Coal
sedimentary
Chert (specifically Chert Nodule/Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary