Mineraloid (Human Made Geological Specimen)

Gold Ore

Native Gold in Quartz (Au)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Milky Quartz

Silicon Dioxide (SiO2)

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Petrified Wood (Silicified Wood)

Silicified Wood / Silicon Dioxide (SiO2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz / Rock Crystal

Silicon Dioxide (SiO2)

Quartz (White/Milky with Iron Staining)

Silicon Dioxide (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Gray variety)

Silicon Dioxide (SiO2)

Jasper Breccia

Silicon Dioxide (SiO2) - Brecciated Microcrystalline Quartz

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Conglomerate

Conglomerate (clastic sedimentary rock)

Chalk

Calcium Carbonate (CaCO3)

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz Pebbles)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Alexandrite in Matrix

Chrysoberyl (BeAl2O4 with Chromium impurities)

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Quartz with Mica Schist (Pegmatite Specimen)

SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)

Weathered Sandstone with Algae Growth

Arenite

Flint / Chert

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Rock (Mainly SiO2)

Limonite after Pyrite (Pseudomorph)

FeO(OH)·nH2O following FeS2

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite (Quartz-rich Cobble)

Quartzite (SiO2)

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Quartz Geode

Silicon Dioxide (SiO₂)

Diamond in Gold Setting

Diamond (C - pure carbon)

Clear Quartz

Silicon Dioxide (SiO2)

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Sandstone with Iron Concretion

Arenite with Limonite/Goethite Concretion

Granodiorite

Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Basalt

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂)

Native Copper with Cuprite and Quartz

Copper (Cu), Cuprite (Cu2O), Quartz (SiO2)