Mineral_rock

Polished copper-bearing mineral specimen, likely malachite-rich copper ore

Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite

Malachite and Cuprite on Host Rock

Cu2CO3(OH)2 (Malachite) and Cu2O (Cuprite)

Schist

Metamorphic rock (Schist)

Pyrite-bearing Rock / Pyrite Ore

Iron Sulfide (FeS2) in host rock matrix

Granite

Felsic intrusive igneous rock

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Quartz Pebble

Silicon Dioxide (SiO2)

Fine-grained mafic rock, likely basalt or altered basalt

Basalt; chiefly plagioclase feldspar and pyroxene, with possible chlorite/serpentine alteration

Quartz Crystal in Matrix

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Weathered metallic sulfide-bearing rock, possibly chalcopyrite ore

Likely chalcopyrite (CuFeS₂) in a weathered host rock; identification is uncertain from the photograph

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Pink-and-white quartz-rich rock, likely rose quartz matrix

Quartz (SiO₂), possibly intergrown with feldspar or chalcedony

Sodalite-bearing rock, likely sodalite-rich syenite or sodalite in feldspathic matrix

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, with probable feldspar and accessory minerals

Red jasper in gray host rock (likely hematite-stained quartzite or rhyolite)

Jasper: microcrystalline quartz (SiO₂), with iron-oxide coloration; exact host uncertain from image

Green Aventurine

Quartz (SiO2) with fuchsite inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Garnet in Schist (Garnetiferous Micaceous Schist)

Almandine Garnet, Fe3Al2(SiO4)3

Magnetite with Quartz

Magnetite (Fe3O4)

Gabbro or coarse-grained dioritic rock

Plutonic mafic/intermediate rock; typically plagioclase feldspar + pyroxene ± amphibole/biotite

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Blue Topaz

Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2

Quartz (possibly Citrine or Smoky Quartz variety)

Silicon Dioxide (SiO2)

Agate Geode

Silicon Dioxide (Chalcedony/Quartz), SiO2

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Sapphire (Faceted)

Corundum (Al2O3)

Sandstone

Quartzose Sandstone (Sedimentary Rock)

Granite Pebble

Phaneritic intrusive igneous rock

Granite

Felsic intrusive igneous rock

Granite

Phaneritic Felsic Igneous Rock

Granite

Granite (Phaneritic Igneous Rock)

Orthoclase Feldspar (Salmon variety)

Orthoclase, KAlSi3O8

Quartz Pebble

Silicon Dioxide (SiO2)

Amber

Fossilized Tree Resin

Granite

Phaneritic felsic intrusive igneous rock

Quartz (Fieldstone/Pebble)

Silicon Dioxide (SiO2)

Asphalt Chunk

Asphalt concrete

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Sandstone (Sedimentary Rock)

Arenite (SiO2 based)