Likely tumbled calcite or pale limestone fragment
Calcite (CaCO₃), possibly microcrystalline limestone
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Metamorphic (Low Grade) in the encyclopedia
View all →
Chalcedony (Agate) Pebble
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Amygdaloidal Basalt with Epidote
Amygdaloidal Basalt (Ca2(Al,Fe)3(SiO4)3(OH))
igneous
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
sedimentary
Corundum
Corundum (Al2O3)
Mineral
Quartz with Iron Oxide
Silicon Dioxide (SiO2)
mineral
Kyanite (Blue or Blue-Grey)
Kyanite (Al2SiO5)
metamorphic mineral
Grey River Stone (Quartz-rich Quartzite/Siltstone)
Quartzite / Meta-siltstone (primarily SiO2)
Metamorphic (low-grade)
Barite (Desert Diamond)
Barite (Barium Sulfate, BaSO4)
mineral
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Chalcedony (Pink/Gray variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
sedimentary
Conglomerate
Conglomerate Rock
sedimentary
Ironstone Concretion
Ferruginous Sandstone / Hematite-rich Concretion
sedimentary
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ironstone (primarily FeO(OH)·nH2O)
sedimentary
Ferruginous Sandstone (Grit)
Clastic Sedimentary (Ironstone-rich Sandstone)
sedimentary
Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Garnet-Bearing Schist
Almandine Garnet Schist
metamorphic
Green Mica Schist
Mica Schist (Fuchsite or Chlorite variety)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Bloodstone
Chalcedony (Variety Heliotrope), SiO2
mineral
Weathered limestone or calcitic cave deposit
Calcite (CaCO₃), likely porous limestone/travertine
sedimentary
Iron-rich sandstone (Gozan/Ironstone)
Ferruginous Sandstone (clastic sedimentary rock)
sedimentary
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Chert (variously identified as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Sandstone with Iron Oxide (Limonite/Hematite)
Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Puddingstone (Jasper Conglomerate)
Quartzite Conglomerate (SiO2 matrix with Jasper/Quartz pebbles)
sedimentary
Puddingstone (Quartzite Conglomerate with Jasper inclusions)
Metaconglomerate (Silicon Dioxide, SiO2)
sedimentary