Potassium Feldspar (Microcline / Orthoclase)
KAlSi3O8
mineral
Category
Not A Rock Or Mineral
Browse not a rock or mineral specimens identified by the Rock Identifier community.
Learn about Not A Rock Or Mineral in the encyclopedia
View all →
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
SiO2 (Silicon Dioxide with Hematite inclusions)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate / Quartz Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Grey Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Agate (Polished Slice)
Silicon Dioxide (SiO2)
mineral
Banded Agate (Lake Superior Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Agate / Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Silicon dioxide (SiO2) - Pseudomorph after crocidolite
mineral
Quartz pebble with surface markings
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt or Porphyritic Andesite
Porphyritic volcanic rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fuchsite
K(Al,Cr)2(AlSi3)O10(OH)2
mineral
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Granodiorite
Granodiorite
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Sandstone
Sedimentary quartz arenite
sedimentary
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Sandstone
Clastic sedimentary rock composed mainly of quartz sand
sedimentary
Weathered River Rock (likely Chert or Basalt with algae)
Silicon dioxide (SiO2) with organic biofilm
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz Pebble (Tumbled / River Pebble)
Silicon Dioxide (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Lake Superior Agate
Banded Chalcedony (Silicon Dioxide, SiO2)
mineral
Felsic gneiss, likely granitic gneiss
Quartz–feldspar–mica gneiss; commonly quartz + plagioclase/K-feldspar + biotite or hornblende
metamorphic
Jasper / Quartz Pebble
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2) with trace minerals
mineral
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Likely weathered iron-rich stone
Uncertain; possibly limonite/goethite-bearing rock
mineral
Quartz Geode
Silicon Dioxide (SiO2) within Sedimentary or Igneous host
mineral
Fuchsite (Green Muscovite)
Fuchsite (Chromium-rich Muscovite), K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary