Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
sedimentary
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Fluorite and Red Jasper
Fluorite (Calcium Fluoride, CaF2) and Red Jasper (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Blue Lace Agate
Chalcedony (a form of Quartz) - SiO2
Mineral
Pyrite in Matrix (Quartz/Schist)
Iron Sulfide (FeS2)
mineral
Nephrite Jade
Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)
mineral
Gneiss
Gneiss
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Quartzite (River Cobble)
Quartzite (primarily SiO2)
metamorphic
Calcite
Calcite (CaCO3)
mineral
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Marble
Metamorphosed Limestone (main mineral: Calcite, CaCO3)
metamorphic
Biotite Schist
Biotite-rich Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Quartz (Milky/Common variant)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite on Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral