Mineral In A Matrix (Likely Quartz Or Feldspar)

Amazonite

Microcline (KAlSi3O8) with lead impurities

Weathered porphyritic pebble

Likely porphyritic volcanic rock, possibly andesite or rhyolite

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and biotite/hornblende

Sandstone

Arenite (primarily SiO2)

Milky quartz (likely weathered quartzite or quartz vein fragment)

Quartz, silicon dioxide (SiO₂)

Dalmatian Jasper (Dalmatian Stone)

Perthitic Feldspar with Arfvedsonite/Riebeckite

Likely weathered gneiss or mica-rich schist

Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist

Garden Quartz

Silicon Dioxide (SiO2) with various inclusions (Lodolite)

Porphyritic basaltic-andesite

Porphyritic intermediate volcanic rock; chiefly plagioclase and pyroxene/amphibole, with altered mafic minerals and iron oxides

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Pegmatite containing Muscovite and Quartz

Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)

Basalt with Quartz/Calcite Inclusion

Aphanitic Mafic Igneous Rock (Basalt) with SiO2 or CaCO3 vein

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

Biotite-bearing granite or granodiorite

Coarse-grained quartz–feldspar rock with biotite; approximate composition: quartz + plagioclase/K-feldspar + biotite ± hornblende

Granite

Granite (Phaneritic intrusive igneous rock)

Ocean Jasper

Orbicular Jasper (varietal of SiO2 with impurities)

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Gneiss Pebble

Gneiss (High-grade metamorphic rock)

Beryl (var. Heliodor or Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Lepidolite with Tourmaline in Quartz Matrix

K(Li,Al)3(Si,Al)4O10(F,OH)2 (Lepidolite) / SiO2 (Quartz)

Granite

Granite

Granite (Pink/Potassium Feldspar Granite)

Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)

Weathered porphyritic volcanic rock

Likely altered andesite or rhyolite porphyry

Quartz Vein in Matrix / Quartzite

Silicon Dioxide (SiO2) with host rock

Granite Boulder (Glacial Erratic)

Granite

Quartz with Host Rock

Silicon Dioxide (SiO2)

Granite (with Beryl/Aquamarine)

Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)

Pegmatite (Quartz and Feldspar)

Igneous Pegmatite containing SiO2 and KAlSi3O8

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Weathered granite or granitic gneiss fragment

Granite, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

Granitic Pegmatite with Tourmaline/Chlorite

Pegmatite

Quartz-rich granitic pegmatite fragment

Pegmatite, composed mainly of quartz (SiO₂), feldspar, and mica

Granite

Granite (Felsic Plutonic Rock)

Granite

Coarse-grained felsic intrusive igneous rock; mainly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Unakite

Epidote–pink feldspar–quartz rock

Granitic Pegmatite

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)

Weathered granite or granitic gneiss fragments

Granite; primarily quartz, feldspar, and mica (composition uncertain from image)

Gneiss with Quartz/Feldspar Vein

Quartz-Feldspathic Gneiss

Milky quartz (likely weathered quartz vein)

Quartz, silicon dioxide (SiO₂)

Likely weathered granite or granitic pebble

Granite; primarily quartz (SiO₂), feldspar, and mica

Quartz / Calcite Vein Rock

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar

Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite