Yellow Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Category
Mineral, Often Found As A Rock
Browse mineral, often found as a rock specimens identified by the Rock Identifier community.
Fluorite with Quartz coating
Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Chert (Iron-stained)
Chert (Silicon Dioxide, SiO2)
sedimentary
Carnelian
Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)
mineral
Chert (with Quartz/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Shale
Shale (clastic sedimentary rock)
Sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Limonite (often after Hematite or Goethite)
Limonite (FeO(OH)·nH2O)
mineral
Quartzite Cobble
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Jasper
Silicon dioxide (SiO2) with iron oxide impurities
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint Nodules
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Stichtite (often found in Serpentinite)
Stichtite Mg6Cr2CO3(OH)16·4H2O
Mineral
Anthracite Coal
Anthracite (a variety of coal, predominantly carbon)
Sedimentary Rock (Metamorphosed)
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Tiger's Eye (Mineral Collection)
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Druzy Quartz on Limestone
Silicon Dioxide (SiO2)
mineral
Jasper and Yellow Chert (Tumbled)
Microcrystalline Quartz (SiO2)
sedimentary
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide SiO2)
Igneous
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Banded Rhyolite (likely Green Jasper/Agate variety)
Silicon Dioxide (SiO2) with mineral inclusions
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone Concretion
Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
mineral / metamorphic
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone with Calcite Vein
Clastic sedimentary rock (primarily SiO2) with Calcium Carbonate (CaCO3) infilling
sedimentary