Sandstone (Micaceous)
Arenite (primarily SiO2 with Phyllosilicates)
sedimentary
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Halite
Halite (NaCl)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
River Stone (Basalt Porphyry)
Porphyritic Basalt
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
River Pebble (likely Quartzite or Chert)
Silicon Dioxide (SiO2)
metamorphic or sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Chert (Common Opal variant)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Agate
Agate (Silicon Dioxide, SiO2)
mineral
River Pebble (Brecciated Chert/Siltstone)
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Cloudy Quartz (or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartzite
Metamorphic Quartz (SiO2) with limonite/hematite staining
metamorphic
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (or Diamond Simulant)
Carbon (C) - Native Element
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Tiger's Eye
Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2
metamorphic
Carnelian (Carnelian Agate)
Silicon dioxide (SiO2) - a variety of Chalcedony
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
mineral
Grey Quartz (likely Smoky Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite (River Cobble)
Quartzite (SiO2)
metamorphic
Rose Quartz
SiO2 (Silicon Dioxide)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Cat's Eye Moonstone (Feldspar)
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) inclusions
mineral