Igneous, Sedimentary, And Metamorphic Mix

Asphalt (Bituminous Concrete)

Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Chert (Jasper/Agate mix)

Microcrystalline Quartz (SiO2)

Copper-bearing Basalt with Epidote and Quartz

Native copper in basalt amygdaloidal matrix

Asphalt Chunk

Asphalt concrete

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Graywacke Pebble with Quartz Vein

Argillaceous Sandstone (Graywacke)

Fancy Jasper

Silicon Dioxide (SiO2) with impurities

Chert with Epidote and Jasper inclusions

SiO2 (Silicon Dioxide) with Ca2(Al, Fe)3(SiO4)3(OH) inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Tumbled Carnelian and Quartz Mix

Silicon Dioxide (SiO2) with iron oxide impurities

Fluorite-Gedrite in Quartz (Schist)

Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix

Granite Sand and Gravel Mix

Phaneritic Felsic Igneous Plutonic Assemblage

Diorite

Diorite (Intermediate intrusive igneous rock)

Chert (Jasper/Agate mix)

Microcrystalline Quartz (SiO2)

Pumice (specifically a water-worn, weathered variety)

Vesicular volcanic glass

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar (K,Na)AlSi3O8, and Plagioclase Feldspar)

Tumbled orbicular granite

Granite, commonly biotite–quartz–feldspar granite with orbicular or mafic enclaves

Tumbled dark stone, likely basalt

Basalt; fine-grained mafic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Diorite (Salt and Pepper Rock)

Diorite

Chert / Jasper

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Agate mix)

Microcrystalline Quartz (SiO2)

Chert (and Chert-Jasper mix)

Microcrystalline Quartz (SiO2)

Tumbled quartz-rich stone, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite if composed of interlocked quartz grains

Graywacke with Quartz Veins

Argillaceous Sandstone (Graywacke)

Chert (Jasper variety)

Chert (SiO2)

Banded Agate

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Mixed rock and mineral specimen collection

Varied silicate, carbonate, and oxide minerals; individual identification is not possible from this group photograph

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Magnetite

Magnetite (Fe3O4)

Weathered quartz-rich rock fragment

Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing

Tumbled quartz-rich stone, possibly granite or sandstone

Uncertain from image; likely quartz (SiO₂) with iron-oxide and feldspar impurities

Feldspar-rich granite or granitic gneiss with dark inclusion

Granite, likely quartz–feldspar–mica rock; dark area may be biotite-rich enclave or weathered mafic inclusion

Chlorite-rich metamorphic rock, likely greenschist

Greenschist; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Small quartz-rich mineral fragment

Quartz (SiO₂), possibly milky or chalcedonic quartz

Tumbled brown pebble

Indeterminate; likely quartz-rich sandstone or chert

Asphalt Pavement (with aggregate)

Asphalt concrete

Quartz

Silicon dioxide (SiO2)

Pumice

Pumice (a highly vesicular volcanic glass)