Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
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Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Rock Crystal Quartz
Silicon Dioxide (SiO2)
mineral
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Green-and-gold apatite-bearing rock, possibly epidote skarn
Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing
mineral
Tumbled Rose Quartz
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Granite Pebble
Intrusive Igneous Rock
igneous
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Quartz-rich rock fragment, possibly granite or quartzite
Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining
igneous or metamorphic
Quartz (Milky Quartz / Quartz Specimen)
Silicon Dioxide (SiO2)
mineral
Orange Calcite (Carved as a Horned Skull)
Calcium Carbonate (CaCO3)
mineral
Conglomerate
Conglomerate
Sedimentary
Vesicular basalt (possibly amygdaloidal basalt)
Basalt, chiefly plagioclase feldspar and pyroxene, with possible olivine and secondary mineral infillings
igneous
Hag Stone
Perforated Flint or Chert
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene minerals)
Igneous
River Pebbles (Mixed Lithology)
Conglomerate clasts (Silica-rich and Metamorphic assemblages)
sedimentary
Fossil Shell Fragment (possibly Brachiopod or Bivalve)
Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Moss Agate
SiO2
mineral
Amethyst-bearing quartz cluster
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz
sedimentary
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Limonite (Ironstone) Concretion
FeO(OH)·nH2O (Hydrous ferric oxide)
sedimentary
Diorite
Phaneritic intermediate plutonic rock
Igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic