Granite

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Gabbro

Gabbro (composed mainly of calcium-rich plagioclase feldspar and pyroxene)

Jasper containing epidote (Unakite-like)

Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Milky Quartz (Water-worn Pebble)

Quartz (Silicon Dioxide, SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granitic Pegmatite

Pegmatite (composed primarily of Quartz, Feldspar, and Muscovite mica)

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Granitic Pegmatite (River Rock specimen)

Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Mahogany Obsidian

Obsidian (volcanic glass with Hematite/Magnetite inclusions)

Diorite

Plutonic Igneous Rock (Intermediate Composition)

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Smoky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Small fragments)

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (Sodium iron aluminum borosilicate), NaFe3Al6(BO3)3Si6O18(OH)4

Amazonite

Microcline (variety Amazonite) - K(AlSi3O8)

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide; NaFe2+3Al6Si6O18(BO3)3(OH)3OH

Amazonite

KAlSi3O8 (Potassium aluminum silicate - blue-green variety of Microcline)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Alexandrite in Matrix

Chrysoberyl (BeAl2O4 with Chromium)

Green Fluorite

Calcium Fluoride (CaF2)

Amazonite

Microline Feldspar (KAlSi3O8)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Mica (specimen appears to be Muscovite or Phlogopite)

Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2

Mica in Quartz Host

Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Amazonite (with smoky quartz/red jasper inclusions)

Tectosilicate - Microcline Feldspar (KAlSi3O8)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Schorl (Black Tourmaline)

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Moonstone with Black Tourmaline

Orthoclase (KAlSi3O8) with Schorl inclusions (NaFe3Al6(BO3)3Si6O18(OH)4)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)