Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
Sandstone (with potential fossil fragments)
Sandstone (SiO2 dominated with iron oxides)
sedimentary
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Red Sandstone
Ferruginous Sandstone
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous limestone, possibly containing a brachiopod or bivalve fossil
Calcite-rich limestone (CaCO₃), with an apparent shell impression or shell fragment
fossil
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) protrusion
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Smoky quartz
Quartz (SiO₂), naturally irradiated brown variety
mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Likely schist, possibly serpentinite
Mica schist; potential chlorite–serpentine-rich metamorphic rock
metamorphic
Polished Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Red Sandstone
Arenite (with Iron Oxide cement)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone
Arenite (SiO2 with various cementing agents)
sedimentary
Chert (with potential fossil inclusion)
Microcrystalline Quartz (SiO2)
sedimentary
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
sedimentary
Weathered fossiliferous limestone pebble
Calcitic limestone, predominantly CaCO₃ (likely containing fossil or bioclast fragments)
sedimentary
Dalmatian jasper
Dalmatian stone, typically a leucocratic alkali-feldspar-rich porphyritic igneous rock with black arfvedsonite or aegirine inclusions
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Fossilized Shark Tooth
Carcharhinus sp. (likely Bull or Requiem shark family)
sedimentary
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Quartz (Iron-Stained / Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Weathered quartz-rich rock, possibly milky quartz or quartz-bearing granite
Quartz (SiO₂), potentially with feldspar and iron-oxide staining
mineral
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Pink quartz-rich stone, likely rose quartz
Rose quartz; quartz, SiO₂, commonly colored by trace elements and microscopic inclusions
mineral
Tumbled jasper (likely ocean or orbicular jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and dark accessory minerals
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral