Mineral In A Matrix (Likely Quartz Or Feldspar)

Quartz-rich pegmatite (likely feldspar and quartz)

Granitic pegmatite composed mainly of quartz (SiO₂) and feldspars

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Garnet-bearing metamorphic rock, likely garnet gneiss or garnet amphibolite

Garnet-bearing gneiss; red crystals likely almandine garnet, Fe₃Al₂(SiO₄)₃

Porphyritic Basalt (likely Chinese Writing Stone)

Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix

Weathered igneous rock fragment, possibly granite or granitic gneiss

Indeterminate; likely quartz–feldspar–mica aggregate (granite), possibly foliated gneiss

Granite pebble

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Granite (likely)

Granite, a quartz–feldspar plutonic rock

Granite

Intrusive Felsic Igneous Rock

Feldspar-rich Quartzite

Feldspathic Quartzite (Metamorphosed Sandstone)

Quartz Veined Siltstone

Siltstone with Quartz Intrusion (SiO2)

Unidentified small mineral fragments

Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image

Porphyritic Basalt (River Rock)

Porphyritic Basalt

Basalt with Jasper Veining

Basaltic Rock with Cryptocrystalline Quartz (SiO2)

Quartz-rich Diorite

Diorite (Phaneritic intermediate igneous rock)

Native gold-bearing quartz/rock fragment

Native gold (Au), likely in quartz or iron-oxide matrix

Drupa Quartz (Sparkly Drusy Quartz on Matrix)

Crystalline Silicon Dioxide (SiO2) on host rock

Quartz-rich pegmatite

Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and mica

Porphyry (Rhyolite / Andesite Porphyry Pebble)

Porphyritic Igneous Rock

Vesicular volcanic rock, likely pumice or scoriaceous rhyolite

Pumice/scoria; predominantly silicate glass with quartz–feldspar minerals

Quartz-bearing granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly weakly metamorphosed

Basalt in a vesicular volcanic host rock

Basalt, likely with secondary zeolite or calcite infill

Quartz-rich pegmatite, likely with iron staining

Granitic pegmatite, chiefly quartz (SiO₂) and feldspar, with possible mica and iron oxides

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with minor mica and dark accessory minerals

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic fragment; exact identification requires testing

Weathered coal-bearing sedimentary rock (likely shale or mudstone with coal fragments)

Carbonaceous shale/mudstone; predominantly clay minerals, quartz, and organic carbon

Small pale stone fragment (undetermined)

Unidentified; the image lacks diagnostic detail for a reliable identification

Conglomerate (likely polymictic conglomerate)

Clastic sedimentary rock composed of rounded lithic and mineral clasts in a finer matrix; commonly quartz, feldspar, chert, and volcanic fragments cemented by silica, calcite, or iron oxides

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Granite Pebble

Granite (Plutonic Igneous Rock)

Weathered rounded stone, likely quartz-rich sandstone or granitoid

Indeterminate feldspathic quartz rock; possibly weathered granite or granitic gneiss

Aquamarine with Quartz

Beryl (Be3Al2Si6O18) with Quartz (SiO2)

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or mica inclusions

Likely labradorite or another feldspar-rich rough stone

Possibly labradorite, a plagioclase feldspar: (Ca,Na)(Al,Si)₄O₈; identification is uncertain from the image

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

White Howlite

Howlite (Hydrated calcium borosilicate, Ca2B5SiO9(OH)5)

Conglomerate

Polymictic clast-supported conglomerate, likely carbonate-rich

Quartz-rich mineral specimen, possibly druzy quartz with iron staining

Quartz (SiO₂), possibly coating a vesicular host rock

Sandstone with Quartz Vein

Arenite with Crystalline Silica (SiO2)

Tumbled pale quartz or calcite pebble

Likely quartz (SiO₂) or calcite (CaCO₃)

Clear Quartz Crystal on Matrix

SiO2 (Silicon Dioxide)

Feldspar (Granite Pegmatite matrix)

Potassium Feldspar (KAlSi3O8) / Quartz Mixture

Quartz–feldspar–biotite pegmatite

Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and biotite mica