Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
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.
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone
sedimentary
Basalt Pebble
Mafic Igneous Rock (Basalt)
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Chalcedony with Matrix
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Orbicular Jasper (Ocean Jasper variant)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Mica Schist with Iron Staining
Mica Schist
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Galena
Lead(II) sulfide (PbS)
mineral
Chert (Jasper/Mudstone variety with Oxidation)
Silicon dioxide (SiO2)
sedimentary
Agate Geode / Thunderegg
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Jasper
Jasper (Silica/Quartz) - SiO2
mineral
Chert (White Chert or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Greywacke (River Siltstone)
Lithic Sandstone / Greywacke
sedimentary
Vesicular Basalt with Lichen
Vesicular Basalt
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide - SiO2)
mineral
Rose Quartz
Quartz (Silicon Dioxide - SiO2) with trace amounts of titanium, iron, or manganese
mineral
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Lava Stone and Chakra Beads
Basalt (with various mineral/synthetic beads)
igneous
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Banded Agate (Dyed)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Chert (Chalk-associated Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Greywacke (River Siltstone)
Lithic Wacke (Sandstone subfamily)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide with impurities), SiO2
mineral
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony (Botryoidal/Tumbled Agate)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Smoky Quartz or Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Agate (Carnelian-like)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Smoky Quartz on Matrix
Silicon Dioxide (SiO2) with trace impurities and aluminum inclusions
mineral
Iron-Stained Quartz (Riverside Cobble)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral