Malachite with Chrysocolla
Copper carbonate hydroxide (Cu2CO3(OH)2) and Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
Pyrite
Iron Sulfide (FeS2)
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)
mineral
Quartzite (River Stone)
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Aquamarine
Aquamarine (Beryl variety); Be3Al2Si6O18
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz in Conglomerate Matrix
Silicon Dioxide (SiO2) within Clastic Sedimentary Rock
sedimentary
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Bauxite (Concretionary)
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Yellow Jade (Nephrite or Quartzite variety)
Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite) / SiO2 (Quartzite variant)
metamorphic
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)
metamorphic
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert Nodules (with Gryphaea or Shell inclusions)
Microcrystalline Quartz (SiO2) with Calcitic inclusions
sedimentary
Hag Stone
Calcareous sedimentary rock (often Chert, Flint, or Limestone)
sedimentary
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Labradorite
Feldspar (variety of Anorthite), (Ca,Na)(Al,Si)4O8
mineral
Acicular Azurite (indicated by deep blue, fibrous/fuzzy appearance)
Azurite (Copper Carbonate Hydroxide) - Cu3(CO3)2(OH)2
mineral
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Epidosite (Unakite-related)
Epidosite (predominantly Epidote, Ca2(Al2,Fe3+)(SiO4)3(OH))
metamorphic
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2
mineral
Green Quartzite (River Stone)
Metamorphic Quartz (SiO2) with inclusions (typically Fuchsite or Chlorite)
metamorphic
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Scoria
Scoria (Vesicular Basaltic Glass)
Igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))
sedimentary
Massive Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Botryoidal Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Chert (often called Flint when dark)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Chert (variations include Flint or Jasper)
Chert (Silicon Dioxide, SiO2)
sedimentary