Mixed (Igneous, Sedimentary, Metamorphic, And Minerals)

Gneiss

Gneiss

Mixed rounded river pebbles, likely basalt and granite

Basalt (fine-grained mafic rock) and granite/granitoid (quartz–feldspar rock)

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Red Jasper with Quartz Veining

Microcrystalline Quartz (SiO2)

Amazonite (likely mixed with other feldspars/minerals)

Amazonite is a variety of Microcline, which is a tectosilicate mineral, formula KAISi3O8. The mixed beads could include other feldspars or quartz.

Weathered schist or gneiss fragment

Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Green Gneiss

Metamorphic Gneiss

Gravel and Pebbles

Unconsolidated rock fragments (clastic sediment)

Mixed rounded river gravel

Polymictic alluvial gravel; likely mixtures of quartzite, granite, basalt, sandstone, and other silicate rocks

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Hematite-rich ironstone concretion

Hematite (Fe₂O₃), likely mixed with goethite/limonite and silica

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Carved Merkaba)

Silicon Dioxide (SiO2)

Copper Ore Specimen

Cupriferous Rock / Malachite-bearing ore

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined schist; predominantly SiO₂ (quartz) with possible feldspar, mica, and iron-oxide minerals

Quartz Pebble

Silicon Dioxide (SiO2)

Chrysocolla-rich copper ore

Chrysocolla, a hydrated copper silicate; composition is variable and commonly mixed with quartz or copper oxides

Quartz pebble

Silicon dioxide (SiO2)

Gneiss

High-grade Metamorphic Gneiss

Gneiss

Gneiss (High-grade Metamorphic Rock)

Mixed rock and mineral gravel

Predominantly granite/granodiorite, basaltic rocks, quartz, and possible gneiss; exact identification is uncertain from the image

Orange Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss (High-grade metamorphic rock)

Chrysocolla in Matrix

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O

Banded Iron Formation (Jaspilite / Hematite Jasper)

SiO2 + Fe2O3 (Quartz with Hematite/Magnetite)

Banded Gneiss

Gneiss (Metamorphic Rock)

Greenschist

Chlorite schist

Greenschist

Chlorite schist