Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
sedimentary
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Tufa
Calcareous Tufa (Calcium Carbonate, CaCO3)
sedimentary
Shattuckite (Blue Quartz/Jasper Matrix)
Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)
mineral
Tektite (Indochinite)
Tektite (natural glass, SiO2 + Al2O3)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Ironstone Concretion / Limonite
Goethite and Limonite (FeO(OH)·nH2O)
sedimentary
Chrysocolla in Matrix
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Blue Lace Agate
Chalcedony (SiO2)
mineral
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
mineraloid / man-made glass
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Pink Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Sandstone (Gozzan/Ironstone)
Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)
sedimentary
Satin Spar (Selenite variant)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Tree Agate
Silicon Dioxide (SiO2) with Dendritic Inclusions
Mineral
Chrysocolla on Quartz
Chrysocolla (Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O) often associated with Quartz (SiO2)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Chrysocolla on Matrix
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Yellow Quartz (Citrine Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Opalite
Synthetic Opalised Glass
mineral
Pink Quartzite
Quartzite (SiO2)
metamorphic
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Aventurine and Amazonite
Silicon Dioxide (SiO2) with inclusions and Microcline (KAlSi3O8)
Mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Breciated Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
sedimentary
Ironstone Concretion (Limonite/Hematite Nodules)
Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)
sedimentary
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Amazonite
Potassium Feldspar (Microcline) - KAlSi3O8
mineral
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Quartz-Arenite (with Goethite/Hematite cement)
sedimentary
Amazonite (with smoky quartz/feldspar inclusions)
K(AlSi3O8), Microcline (Tectosilicate)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Chrysocolla in Quartz (Quantum Quattro variant)
Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) often mixed with SiO2
mineral