Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Fossilized Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
mineral
Strawberry Quartz
Quartz with Hematite inclusions (SiO2 + Fe2O3)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Amazonite
Microcline (KAlSi3O8) with Pb impurities
mineral
Bivalve Fossil (Clam/Mollusk)
Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)
sedimentary
Chrysocolla in Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4' nH2O on Quartz/Feldspar matrix
mineral
Alexandrite
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Jasper River Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Golden Healer Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxides (FeO(OH)·nH2O)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2 with Fe impurities)
mineral
Blue Chalcedony Geode (with Quartz Druzy)
Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz
mineral
Dyed Pumice
Vesicular Rhyolite (Artificial Coloration Addition)
igneous
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
sedimentary
Charoite
Charoite (Hydrated potassium, sodium, calcium, barium, strontium silicate hydroxide fluoride)
metamorphic
Synthetic Resin / Plastic Figurine
Synthetic Polymer (Copolymer of Polyethylene or Resin)
Mineraloid-like Synthetic Material
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Thunderegg (Ate Agate/Jasper Geode)
Silicon Dioxide (SiO2) within Rhyolite/Perlite matrix
sedimentary/igneous intermediary
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Shattuckite (Blue Quartz/Jasper Matrix)
Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)
mineral
Amethyst Geode
Silicon dioxide (SiO2) with iron impurities
mineral
Quartz Geode with Goethite/Hematite
Silicon Dioxide (SiO2) with Iron Oxides
mineral
Petoskey Stone (Coral Fossil)
Hexagonaria percarinata (Fossilized colonial rugose coral)
sedimentary
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Vesicular Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Gold Nugget
Native Gold (Au)
mineral
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
igneous/sedimentary
Ruby and Diamond in Gold Setting
Corundum (Al2O3) and Diamond (C)
mineral
![Arfvedsonite in Quartz (Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar) — igneous](https://media.rockidentification.com/5af4c6b0-6733-4f77-a6ae-987848327128-thumbnail.jpg)
Arfvedsonite in Quartz
Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar
igneous
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Yellow Jasper
Jasper (SiO2) with iron hydroxide inclusions
sedimentary
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral