Blue Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial pigment
mineral
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
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Dyed Purple Agate Sliced
Silicon Dioxide (SiO2) with artificial pigment
mineral
Granite
Phaneritic plutonic rock (SiO2 primary)
igneous
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Sandstone
Sandstone (Clastic Sedimentary Rock)
Sedimentary Rock
Granite
Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Amethyst (Faceted)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Basalt (River Pebble)
Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Rounded brown-gray stone, possibly weathered conglomerate or sandstone
Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Tumbled gray stone, likely serpentinite or weathered basalt
Tentatively serpentinite (predominantly serpentine-group minerals); identification is uncertain from the photograph
igneous
Eye Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Black Granite
Phaneritic Mafic Igneous Rock (likely Gabbronorite or Dolerite)
igneous
Tumbled tree agate (dendritic agate)
Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites
mineral
Rounded quartz-rich cobble, likely granite-derived stone
Granite or granitic gneiss, composed mainly of quartz, feldspar, and minor mica
igneous
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Red jasper (tumbled river pebble)
Jasper, an opaque microcrystalline variety of quartz/chalcedony (SiO₂), colored mainly by iron oxides
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Amethyst (Tumbled)
Purple Quartz (SiO2 with iron impurities and irradiation)
mineral
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Granite
Granite (compositional mixture of Quartz, Feldspar, and Mica)
igneous
River Cobble (Basalt / Gabbro)
Mafic Igneous Rock (Basaltic / Gabbroic Composition)
igneous
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral
Conglomerate
Clast-supported polymict conglomerate
sedimentary
Bull Quartz with Mica and Host Rock
Massive Quartz (SiO2) with Muscovite/Chlorite inclusions
igneous
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Banded Agate (specifically Eye Agate / Chalcedony)
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Banded Agate (Botswana Agate)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Polished ocean jasper / orbicular jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Green aventurine beads
Quartz (SiO₂), typically green quartzite/aventurine with fuchsite mica inclusions
mineral
Septarian Nodule
Septarian Concretion (CaCO3, CaMg(CO3)2, SiO2)
sedimentary