White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Category
Mineral, Often Found As Detrital Grains In Sedimentary Rocks
Browse mineral, often found as detrital grains in sedimentary rocks specimens identified by the Rock Identifier community.
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Rhodonite
Manganese Inosilicate (MnSiO3)
Mineral
Quartz Geode Pebble
Silicon Dioxide (SiO2)
mineral
Jasper (Tumbled)
Silicon Dioxide (SiO₂)
sedimentary
Magnetite / Iron-Rich Concretion
Magnetite (Fe3O4) or Bog Iron Limonite
mineral
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Quartzite (River Cobble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Banded Agate (with Quartz Geode Center)
Silicon Dioxide (SiO2)
mineral
Yellow Chert (Jasper)
Chalcedony (SiO2) with iron oxide inclusions
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Brick
Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)
Man-made material (constructed)
Quartz Crystal
Quartz (SiO₂)
Mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Red Jasper
Chalcedony (SiO2 with iron oxide impurities)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Gold
Native Gold (Au)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with Crocidolite or Magnesio-riebeckite inclusions
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Carnelian Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)
igneous
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
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
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Crystal Quartz Beads (likely Clear Quartz)
Quartz (SiO₂)
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Hematite (beads)
Hematite (Fe₂O₃)
Mineral
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
River Rocks (Black)
Various lithologies (e.g., basalt, chert, obsidian for black varieties), mechanically rounded clasts
Sedimentary
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) - CuAl6(PO4)4(OH)8·4H2O
mineral