Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
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Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
igneous
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Diamond
C (Carbon)
mineral
Pink Rhodonite
Manganese Silicate (MnSiO3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Flint
Silicon Dioxide (SiO2)
sedimentary
Flint
SiO2 (Microcrystalline Quartz / Chert)
sedimentary
Flint (or Chert)
Silicon Dioxide (SiO2)
sedimentary
Flint
Silicon dioxide (SiO2) - cryptocrystalline quartz
sedimentary
Flint
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Chert / Flint
Cryptocrystalline quartz (SiO2)
sedimentary
Honey/brown agate (chalcedony)
Microcrystalline quartz, SiO₂; likely translucent agate or chalcedony
mineral
Weathered iron-rich rock, likely limonite-bearing sandstone or laterite
Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals
sedimentary
Green aventurine beads
Quartz (SiO₂), typically green quartzite/aventurine with fuchsite mica inclusions
mineral
Rounded pebble, likely quartz-rich sandstone or chert
Indeterminate lithic clast; possibly quartz arenite or microcrystalline quartz (SiO₂)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Chert / Flint
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Pink Thulite
Thulite (Ca2Al3(SiO4)3(OH)) - Pink Zoisite
Mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Diamond
Carbon (C)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Diamond
Carbon (C)
gemstone
Olivine
(Mg, Fe)2SiO4
Mineral
Granite Pebble
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Hornblende)
igneous
Sandstone with Desert Varnish
Arenite with Ferromanganese patina
sedimentary
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Chert
Chert (SiO2, Silicon Dioxide)
sedimentary
Olivine (Peridotite)
Olivine Group; (Mg, Fe)2SiO4
igneous
Flint (Chert)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Likely chlorite-bearing schist (possibly greenschist)
Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar
metamorphic
Dark rounded pebble, likely basalt or volcanic rock
Fine-grained mafic igneous rock; possibly basalt (composition chiefly plagioclase and pyroxene)
igneous
Yellow chalcedony (likely citrine or iron-stained quartz)
Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties
mineral
Pegmatitic rose quartz with black tourmaline
Quartz (SiO₂) with schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄), likely feldspar and mica
igneous
Likely quartzite pebble
Quartzite, predominantly crystalline SiO₂
metamorphic
Tumbled dark stone, likely basalt or chert
Basalt (fine-grained mafic rock), possibly weathered chert; exact identification requires testing
igneous
Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar
Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite
igneous
Iron-rich quartzite or silicified ironstone
Quartz (SiO₂) with iron oxides/hydroxides, likely limonite/goethite and possibly hematite
metamorphic