Igneous

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Granite

Phaneritic Plutonic Felsic Rock

Granite Cobble

Granite

Granite

Granite

Granite Pebble

Igneous Intrusive Rock (Quartz-Feldspar-Mica Phenocrysts)

Granite

Granite (Phaneritic Igneous Rock)

Granite

Phaneritic Felsic Igneous Rock

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Granite

Granite (Felsic Plutonic Rock)

Granite

Intrusive igneous rock (SiO2 range 65-75%)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Dalmatian Stone

Dalmatian Stone (formerly called Dalmatian Jasper)

Mica

Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Coarse-grained igneous rock, likely granitic pegmatite or weathered granite

Granite/pegmatitic granite; chiefly quartz (SiO₂), feldspar, and dark mica or amphibole

Tumbled dark igneous rock, possibly gabbro or basalt

Likely mafic rock composed chiefly of pyroxene and plagioclase; exact identification requires testing

Likely coarse-grained igneous rock, possibly granite or gabbro

Granite (quartz–feldspar–mica) or gabbro (plagioclase–pyroxene); exact identification requires a fresh surface and testing

Likely quartz-rich igneous pebble

Uncertain; possibly granite or quartz-bearing pegmatite

Dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides

Light-colored igneous rock, likely pumice or vesicular rhyolite

Primarily silica-rich volcanic glass and feldspar; exact identification is uncertain from the photograph

Weathered igneous rock, likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; exact identification requires a fresh surface or testing

Weathered dark igneous rock, likely basalt

Basalt, predominantly plagioclase feldspar and pyroxene, with possible olivine and iron oxides

Dark igneous rock fragment, likely basalt

Basalt; commonly composed of plagioclase, pyroxene, and minor olivine or magnetite

Dark igneous rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides

Feldspar-rich igneous rock, likely granite or gneiss fragment

Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image

Rounded dark igneous pebble, likely basalt

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

Pyrite

Iron Sulfide (FeS2)

Dark, coarse-grained igneous rock, likely basalt or gabbro

Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene

Weathered metal-rich igneous rock, likely basalt or komatiitic peridotite

Probable altered mafic–ultramafic rock containing pyroxene/amphibole, olivine, iron oxides, and possible metallic sulfides

Dark igneous rock, likely basalt

Basalt; fine-grained mafic rock dominated by plagioclase and pyroxene, with possible olivine and iron oxides

Dark weathered igneous cobble, likely basalt

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

Polished dark green igneous pebble

Likely gabbro or diabase (dolerite), composed mainly of plagioclase feldspar and pyroxene

Probable rough basalt or mafic igneous fragment

Fine-grained basalt, likely plagioclase–pyroxene–olivine aggregate

Dark igneous rock, likely basalt

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

Dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine

Dark weathered igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Porphyritic Igneous Rock with Iron Oxide Weathering

Weathered Porphyry (containing Quartz, Feldspar, Amphibole/Biotite, and Hematite/Limonite)

Basalt (or similar Mafic Igneous Rock)

Basalt

Copper Ore

Mixed copper sulfides/oxides in gangue matrix

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite

Phaneritic plutonic rock (SiO2 range 65-75%)