Weathered iron-rich rock, likely limonite-bearing sandstone or laterite
Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals
sedimentary
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Malachite / Copper Ore
Cu2CO3(OH)2
mineral
Shale with Trace Fossils
Fissile mudrock (Shale)
sedimentary
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Tumbled Dalmatian jasper
Quartz-rich alkali rhyolite, commonly marketed as Dalmatian jasper; chiefly quartz, feldspar, and dark amphibole/biotite inclusions
igneous
Sandstone
Sedimentary quartz arenite
sedimentary
Basalt Breccia
Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)
igneous
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Zircon
Zirconium Silicate (ZrSiO₄)
mineral
Tumbled chalcedony or quartz-rich stone
Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony
mineral
Likely galena-bearing ore specimen
Galena (PbS), possibly with quartz or calcite gangue
mineral
Red jasper-bearing breccia (probable)
Microcrystalline quartz (SiO₂) with iron-oxide coloration, in a brecciated host
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
River Pebble
Lithified clastic sediment
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-rich translucent pebble, possibly iron-stained quartz or chalcedony
Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)
mineral
Weathered quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂), possibly quartzite with iron-oxide staining
mineral
Weathered quartz-rich rock fragment
Likely quartz-bearing feldspathic rock; exact identification requires testing
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (Per mineral content: SiO2, Quartz/Chalcedony)
fossil
Fossilized Coral
Anthozoa (Fossilized)
Sedimentary / Fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
sedimentary
Moss Agate (Crescent Moon Shape)
Silicon Dioxide (SiO2) with iron/manganese inclusions
mineral