Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Quartz with Mica inclusions (Pegmatite)
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
igneous
Amazonite
Amazonite (Microcline) - K(AlSi3O8)
mineral
Yellow Quartzite Pebble
Quartzite (SiO2 with Iron Oxide staining)
metamorphic
Granite and Igneous Mix
Phaneritic Felsic to Mafic Intrusive Rocks
igneous
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Milky Quartz with Chlorite/Moss Infusions
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Quartzite
SiO2 (Crystalline Quartz)
metamorphic
Quartz with inclusions (likely Tourmaline or Biotite)
Silicon Dioxide (SiO2)
mineral
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate
mineral
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Quartz (worked as a tool or artifact)
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Diamond (Lesedi La Rona specimen)
Diamond (Pure Carbon, C)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Cobble
Quartzite (composed primarily of SiO2)
metamorphic
River Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Quartzite with Iron Inclusions
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)
metamorphic
Limonite-stained Chert/Jasper
Microcrystalline Quartz (SiO2) with Iron Oxides (FeO(OH)·nH2O)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite with inclusions
Quartzite
metamorphic
Quartzite with Gneissic Banding
Quartzite (primarily SiO2) with mafic mineral inclusions
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Jade
There are two distinct minerals commonly known as Jade: Nephrite (a calcium magnesium silicate - Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (a sodium aluminum silicate - NaAlSi2O6). Based on the image showing a typically softer, more fibrous appearance, it is likely Nephrite.
Mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Porphyritic Basalt or Andesite
Porphyritic Basalt / Andesite
Igneous
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Rose Quartz with Schist Matrix
Silicon Dioxide (SiO2) with Mica-Schist
mineral
Chert (Jasper variation)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate - CaCO3
sedimentary