Geode (Unopened)
Chalcedony/Quartz Geode (SiO2)
sedimentary
Category
The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).
Browse the purple specimen is a mineral (amethyst); the white specimen is a sedimentary rock (limestone or marble). specimens identified by the Rock Identifier community.
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Red Jasper
Jasper (Silicate mineral - SiO2)
sedimentary
Chert (specifically a nodule with Chalcendony/Agate banding)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Pebble with Iron Staining
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 oxides)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Connemara Marble
Ophiocalcite (Serpentinitic Marble)
metamorphic
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Agate Geode
Chalcedony (cryptocrystalline SiO2)
mineral
Black Marble with Quartz Veining
Metamorphosed Limestone (Recrystallized CaCO3)
metamorphic
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Gastropod in Chert/Limestone
Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula
sedimentary
Botryoidal Goethite on Quartz
Goethite (α-Fe3+O(OH)) on Quartz (SiO2)
mineral
Chert (Field Stone)
Chert (Silicon Dioxide, SiO2)
sedimentary
Granite (Leucogranite)
Felsic Plutonic Rock (Granite)
igneous
Banded Calcite (often commercially called 'Mexican Onyx')
Calcium Carbonate (CaCO3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
mineral
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
sedimentary
Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Thunderegg (Agate-filled Geode Node)
Silicon dioxide (SiO2) with various inclusions
sedimentary/igneous association
Mookaite Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble with surface markings
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Basalt Pebble
Extrusive Mafic Igneous Rock
igneous
Fossilized Dinosaur Skull (Tyrannosaurus rex)
Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica
sedimentary
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Gneiss (River Cobble)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
sedimentary