Scoria (Lava Rock)
Scoria (Mafic Volcanic Rock)
igneous
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geodic structure
mineral
Green Chalcedony (likely Chrysoprase or Green Onyx)
Silicon Dioxide (SiO2) with trace nickel or chromium inclusions
mineral
Yellow Quartzite (Iron-Stained Quartz)
Quartzite (SiO2 with Fe-oxide impurities)
metamorphic
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
mineral
Black Onyx (Tumbled)
Silicon Dioxide (SiO2)
mineral
Pearl-and-gemstone insect brooch
Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image
gemstone
Quartz Vein in Siltstone
Siltstone with Quartz (SiO2) inclusion
sedimentary
Garnet Schist
Almandine Garnet-bearing Mica Schist
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Black Onyx
Silicon Dioxide (SiO2) - Chalcedony variety
gemstone
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Basalt with Granite Inclusions (Xenolith)
Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)
igneous
Fossiliferous Sandstone (with Quartz patch)
Sedimentary Sandstone with Silicified Shell Fragments
sedimentary
Basalt with Quartz/Calcite Veins
Basalt with hydrothermal vein infill
igneous
Siltstone / Shale River Rock
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Sandstone (Quartzite texture)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
igneous
Arsenic (Native)
Arsenic (As)
mineral
Quartz Geode (Cracked)
Silicon Dioxide (SiO2)
mineral
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Native Sulfur
Sulfur (S8)
mineral
Gold Nugget
Native Gold (Au)
mineral
Grey Chalcedony (Tumbled Moon)
Microcrystalline Quartz (SiO2)
mineral
Scoria (Lava Rock)
Scoria (vesicular mafic igneous rock)
igneous
Vesicular Basalt / Scoria
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Porphyry (specifically Porphyritic Basalt or Andesite)
Porphyritic extrusive igneous rock (Mg,Fe)2SiO4 (Olivine inclusions/Plagioclase Feldspar)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Dendritic Agate
Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)
mineral
Banded Agate Geode
Silicon Dioxide (SiO2)
mineral
Andesite Porphyry
Andesite (extrusive volcanic rock)
igneous
Basalt
Basalt (extrusive volcanic rock)
igneous
Quartz Geode (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral