Mineral In A Matrix (Likely Quartz Or Feldspar)

Porphyritic Basalt (likely Chinese Writing Stone)

Porphyritic Basalt / Plagioclase Feldspar in Basal Matrix

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Granitic Pegmatite with Schorl Tourmaline

Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)

Pegmatite (with Muscovite Mica and Quartz)

Granitic Pegmatite (chiefly KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Flesh-colored Quartz Mineral

SiO2 (Silicon Dioxide) with Iron Impurities

Greywacke (likely)

Greywacke (a type of sandstone)

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Weathered granite or granitic gneiss fragment

Granite, predominantly quartz, feldspar, and dark mica/amphibole

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Granitic Pegmatite with Tourmaline

Granite (Feldspar/Quartz matrix) with Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)

Probable weathered granite or granitic gneiss

Granite/granitic gneiss; mainly quartz, feldspar, and mica

Sandstone (Ferruginous)

Clastic Sedimentary Rock (Sandstone)

Orbicular granite (likely larvikite/rapakivi-type granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, with dark biotite/amphibole and iron-oxide veining

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase phenocrysts)

Diorite with Quartz Veins

Diorite

Banded gneiss (likely biotite-rich gneiss)

Gneiss; chiefly quartz, feldspar, biotite, and possibly hornblende

Rounded quartz-rich beach pebble

Likely milky quartz or quartzite (SiO₂)

Biotite granite (weathered granitic rock)

Granite; chiefly quartz (SiO₂), feldspar, and biotite mica

Rhyolite

Rhyolite

Pegmatitic quartz–feldspar rock with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and biotite/muscovite mica

Graphic Granite

Graphic Granite (variety of Pegmatite)

Quartz

Silicon dioxide (SiO2)

Quartz-rich Diorite

Diorite (Phaneritic intermediate igneous rock)

Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)

Silicon Dioxide (SiO2) with various inclusions

Shale with Quartz Veins

Fissile Sedimentary Rock (SiO2)

Quartz-rich pegmatite, possibly with mica and feldspar

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and biotite/muscovite mica

Quartz, Sandstone, and Siltstone specimens

Silicon Dioxide (SiO2) and Clastic Sedimentary Rocks

Graphic Granite

Pegmatite (Quartz and Alkali Feldspar intergrowth)

Sandstone with Quartz Vein

Arenite with Crystalline Silica (SiO2)

Mica-bearing quartz rock (likely pegmatite)

Quartz–feldspar–mica pegmatite; dark mica is probably biotite, possibly muscovite or chlorite

Granite Pebble

Granite (Felsic intrusive igneous rock)

Granite with Epidote / Unakite precursor

Plutonic igneous rock composed of Quartz, Feldspar, and Epidote/Chlorite

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Rose Quartz with Schist Matrix

Silicon Dioxide (SiO2) with Mica-Schist

Glauconitic Sandstone with possible Trace Fossil

Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Tumbled jasper or rhyolitic porphyry

Silicic volcanic rock, likely rhyolite (quartz- and feldspar-rich), possibly jasperized

K2 Jasper (Beads)

Granodiorite with Azurite and Malachite

Cinnabar in Quartz

Silicon Dioxide (SiO2) with Mercury Sulfide (HgS) inclusions

Graphic Granite

Graphic Granite (variety of Pegmatite)

Smoky quartz crystal/rough fragment

Quartz (SiO₂), likely smoky quartz