Jasper / Quartzite
SiO2
sedimentary/metamorphic
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Agate
Chalcedony (SiO2)
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic
Small brown mineral fragment
Unidentified; the image lacks enough detail for a reliable species-level identification
mineral
Quartz-veined metamorphic cobble
Likely quartzite or quartz-rich metasedimentary rock; veins predominantly quartz (SiO₂)
metamorphic
Carnelian Agate (Tumbled)
Chalcedony (SiO2)
mineral
Schist
Chlorite/Mica Schist
metamorphic
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Rounded quartz-rich river pebbles
Alluvial gravel; commonly quartzite, chert, and quartz-bearing sandstone fragments
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Silicon dioxide (SiO2) - Pseudomorph after crocidolite
mineral
Gneiss
Gneiss
metamorphic
Green Aventurine
Quartzite (Silicon Dioxide, SiO2 + Fuchsite)
metamorphic
Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Gneis
Gneiss (High-grade metamorphic rock)
metamorphic
Rounded quartz-rich pebble, likely quartzite
Quartzite (mostly crystalline quartz, SiO₂)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Weathered quartz-rich rock, possibly chert or quartzite
Likely microcrystalline quartz (SiO₂), but exact identification is uncertain from the photograph
metamorphic
Banded quartzite pebble
Quartzite, predominantly microcrystalline quartz (SiO₂), with a pale quartz vein or relict sedimentary band
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Rounded quartz-rich cobble, possibly quartzite
Quartzite (mostly microcrystalline quartz, SiO₂); identification tentative from the photograph
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Silicified oyster fossil
Fossil oyster shell, commonly Ostrea or Crassostrea, replaced or encrusted by chalcedony/quartz
fossil
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Tumbled yellow-brown quartzite or jasper
Quartzite, predominantly microcrystalline quartz (SiO₂), possibly iron-stained jasper
metamorphic
Adventurine (Green)
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
mineral
Agate
SiO2 (Chalcedony/Quartz)
sedimentary
Quartz-bearing granite or pegmatite fragment
Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende
igneous
Mossy Rock
Mixed lithology rock with Bryophyta (moss)
sedimentary
Schist (Chlorite or Mica-rich)
Chlorite Schist
metamorphic
Likely pyrite-bearing rock
Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix
mineral
Chalcedony (Tumbled Pebble)
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Jasper (Red Jasper)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary