Glauconitic Sandstone
Glauconitic Sandstone (complex silicate formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Category
Igneous Or Sedimentary (Water Worn)
Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich Sedimentary Rock)
sedimentary
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)
igneous
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Granitic Pegmatite
Coarse-grained Granite (KAlSi3O8 + SiO2)
igneous
Basalt (Vesicular)
Basalt (Extrusive Volcanic Rock)
igneous
Basalt with Quartz/Feldspar Vein
Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)
igneous
Celestine (or Celestite) on Matrix
Celestine (SrSO4)
mineral
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
Oolitic Limestone (Oolite)
Oolitic Limestone (primarily Calcium Carbonate, CaCO3)
sedimentary
Ironstone Concretion (Moqui Marble Type)
Goethite/Hematite-cemented Sandstone Concretion
sedimentary
Ironstone Concretion (Moqui Marble type)
Ferruginous Concretion (Fe2O3 / FeO(OH))
sedimentary
Bay Scallop Shell
Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)
sedimentary
Sandstone Moqui Marble (Concretion)
Iron oxide concretion (Hematite/Goethite and Quartz)
sedimentary
Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Serpentinite (often containing Jadeite/Nephrite)
Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Quartzite
Quartzite (primarily SiO2 with inclusions)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Serpentine
Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4
metamorphic
Sandstone
Arenite
sedimentary
Conglomerate
Conglomerate (SiO2 matrix with various silicate clasts)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Conglomerate
Conglomerate
Sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Ocean Jasper
Silicon dioxide with impurities (SiO2 + impurities)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Pink Banded Onyx (Mexican Onyx / Calcite)
Calcite (CaCO3) - microcrystalline calcium carbonate
sedimentary
Jasper (specifically Red Jasper/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with impurities of Iron or Goethite
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pegmatite (White Granite variant)
Pegmatitic Granite (Quartz and Feldspar rich)
igneous
Basalt Porphyry (River Pebble)
Porphyritic Basalt
igneous
Quartz (Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral