Pyrite Cubes in Matrix
Iron Disulfide (FeS2) in Host Matrix
mineral side rock
Category
Mineral Side Rock
Browse mineral side rock specimens identified by the Rock Identifier community.
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Mixed Rock Collection
Polylithic Geological Specimen Mix
sedimentary and igneous
Moon (lunar surface depiction)
Lunar rock; chiefly anorthosite, basalt, and breccia (plagioclase-rich CaAl2Si2O8)
meteorite
Sandstone (with potential fossil fragments)
Sandstone (SiO2 dominated with iron oxides)
sedimentary
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Cowrie Shell Fossil
Cypraea sp.
fossil
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Fossil brachiopod shell
Likely a spiriferid or orthid brachiopod; shell composed mainly of calcium carbonate (calcite)
fossil
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Granite
Granite (Plutonic Felsic Igneous Rock)
igneous
Shiva Eye Shell (Operculum)
Calcium Carbonate (Aragonite), CaCO3
mineral
Fossil Coral
Scleractinia (Fossilized Coral) / Calcium Carbonate (CaCO3) or Silica (SiO2)
fossil
Basalt with Quartz Vein and Weathering Crust
Amygdaloidal or Porphyritic Basalt
igneous
Watermelon Tourmaline
Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4)
mineral
Epidote or Unakite Rock
Epidote-bearing rock / Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Likely polished basalt or iron-rich metamorphic rock
Basaltic rock, chiefly plagioclase and pyroxene; exact identification requires testing
igneous
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Quartzite river pebble
Quartzite (SiO2)
metamorphic
Garnet in Matrix
Almandine/Grossular Garnet in Pegmatite or Schist
mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
mineral
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
River Cobble (likely Metasedimentary)
Metasedimentary Rock / Quartz-rich Sandstone
metamorphic
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Epidosite (Epidote-rich rock)
Epidotalite (primarily Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Likely garnet-bearing rock
Garnet in a dark metamorphic matrix; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃
metamorphic
Polished Ocean Jasper (orbicular jasper)
Microcrystalline quartz (SiO₂), with iron oxides and other alteration minerals
mineral
Cockle Shell Fossil
Cardium (Bivalvia)
fossil
Seashell (Cockle Shell)
Cardiidae (Bivalvia), primary composition: Calcium Carbonate (CaCO3) in the form of aragonite or calcite
fossil
Polished fossil tooth, likely shark tooth
Fossilized selachian tooth; possible sand tiger shark (Carcharias sp.) or related lamniform
fossil
Opal ring (likely precious opal)
Hydrated amorphous silica, SiO₂·nH₂O; the pictured stone may be natural opal or a lab-created/imitation opal
gemstone
Obsidian Arrowhead
Volcanic Glass (SiO2)
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Epidote
Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Unidentified small mineral specimen
Indeterminate from the photograph; it may be a light-colored quartz- or feldspar-rich rock with a dark mineral inclusion.
mineral