Green Aventurine
Aventurine Quartz (SiO2 + Cr-bearing Mica inclusions)
metamorphic
Category
Mineral, Possibly Rock Fragment Containing A Mineral
Browse mineral, possibly rock fragment containing a mineral specimens identified by the Rock Identifier community.
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Limonite with Trace Fossils
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Shale
Mudstone/Shale
sedimentary
Sandstone (Pebble)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Unidentified dark reddish-brown rock or mineral specimen
Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock
mineral
Pegmatite or Graphic Granite
Intrusive Igneous Rock
igneous
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Red Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Conglomerate
Clastic sedimentary rock (Puddingstone)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Geode fragment, likely quartz-lined basalt or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly with iron-oxide staining in a basaltic host
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Quartz (SiO2)
mineral
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Tumbled blue-gray stone, likely sodalite or dumortierite quartz
Most plausibly sodalite (Na₈Al₆Si₆O₂₄Cl₂); identification is uncertain from the image
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Fossiliferous Limestone containing a Brachiopod or Mollusk Impression
Biogenic Sedimentary Rock / Fossiliferous Limestone
sedimentary
Likely pink granite or potassium-feldspar-rich rock
Granite; chiefly quartz (SiO₂), feldspar (KAlSi₃O₈–NaAlSi₃O₈), and minor mica/amphibole
igneous
Granite
Intrusive igneous rock
igneous
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Mica-bearing quartz rock (likely pegmatite)
Quartz–feldspar–mica pegmatite; dark mica is probably biotite, possibly muscovite or chlorite
igneous
Possibly tumbled dark stone or mineral specimen
Indeterminate from image; possibly black tourmaline, basalt, or another dark silicate
mineral
Weathered quartz-bearing rock fragment
Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Quartz-rich granitic pegmatite fragment
Pegmatite, composed mainly of quartz (SiO₂), feldspar, and mica
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Exogyra or Gryphaea species)
fossil
Dark gray slate (possibly argillite or shale)
Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals
metamorphic
Red Painted Rock
Artificial Coated Lithic Fragment
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Tumbled moss agate
Chalcedony (microcrystalline quartz, SiO₂) with moss-like inclusions
mineral