Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary
Category
The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).
Browse the purple specimen is a mineral (amethyst); the white specimen is a sedimentary rock (limestone or marble). specimens identified by the Rock Identifier community.
Granite Cobble
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gold Ore
Native Gold (Au) in Matrix
mineral
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Satin Spar (often marketed as Selenite)
Fibrous Gypsum (CaSO4·2H2O)
mineral
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Orange Calcite
Calcite (CaCO3)
Mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Granite Cobble
Granite (Felsic intrusive igneous rock)
igneous
Milky and Citrine-type Quartz
Silicon Dioxide (SiO2)
mineral
Granite (Dioritic variant)
Granite (Phaneritic Igneous Rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with secondary mineral infilling)
igneous
Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
Igneous
Quartz Pebble (Iron-stained)
Silicon Dioxide (SiO2)
mineral
River Rock (Quartzite)
Quartzite (SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper variation)
Silicon dioxide (SiO2)
sedimentary
Blue Quartzite
Quartzite (specifically a variety enriched with blue-coloring minerals)
Metamorphic Rock
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Quartz / Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Granite (Phaneritic Igneous Rock)
Granite
igneous
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Amygdaloidal Basalt with Epidote
Vesicular Basalt with secondary Epidote/Quartz mineral infill
igneous
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Mineral
Blue Caribbean Calite
Calcium Carbonate (CaCO3) with trace Aragonite
mineral
Vesicular Basalt (Scoria)
Extrusive Mafic Volcanic Rock (FeO-SiO2-MgO)
Igneous
Granite
Felsic Plutonic Rock (primarily SiO2)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Red Jasper
Silicon Dioxide (SiO2) - variety Jasper
mineral
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral