Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Sedimentary
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
Red Sandstone
Arenite (predominantly SiO2 with Fe2O3)
sedimentary
Jasper (likely Kambaba or Crocodile Jasper variety)
Silicon Dioxide (SiO2) with inclusions
sedimentary
Citrine
Silicon dioxide (SiO2)
mineral
Amethyst
Amethyst (Varietal of Quartz), SiO2 (Silicon Dioxide)
mineral
Tan Brown Granite
Phaneritic Biotite-Feldspar Granite
igneous
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))
mineral
Jasper
Jasper (Silica/Quartz) - SiO2
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or limonite inclusions
sedimentary
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Banded Black Onyx (Chalcedony)
Silicon Dioxide (SiO₂)
mineral
Raw Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe/Chlorite)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Indian Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Orca Agate
Chalcedony (SiO2) with various inclusions
mineral
Sandstone (Yellow/Siltstone variant)
Arenite (SiO2 primarily)
sedimentary
Ironstone Concretion (Limonite/Hematite Nodules)
Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)
sedimentary
Basalt with vesicles (Amygdaloidal Basalt)
Amygdaloidal Basalt (predominantly Plagioclase and Pyroxene)
igneous
Basalt
Basalt (predominantly Plagioclase Feldspar and Pyroxene)
igneous
Red Jasper
Jasper (Silica with Hematite impurities), SiO2
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Chert (and Jasper blend)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with high Iron Oxide impurities
mineral
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with iron oxide and other mineral impurities
sedimentary (chemical/biological origin)
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Amazonite
Amazonite / Microcline (KAlSi3O8)
igneous
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Granodiorite
Granodiorite (intermediate plutonic rock)
igneous
Basalt (Crushed Roadstone)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt (Road Aggregate)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Pumice
Vesicular volcanic glass
igneous
Carnelian
Carnelian (Silicon Dioxide: SiO2 with Iron Oxide impurities)
mineral
Banded Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
sedimentary