Mineral_rock

Gneiss (specifically Banded Gneiss)

Gneiss

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz Point

Silicon Dioxide (SiO2)

Agate (Thunderegg segment)

Silicon dioxide (SiO2) - Microcrystalline Quartz/Chalcedony

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Dendritic Agate

Silicon Dioxide with Manganese/Iron oxide inclusions (SiO2)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Tree Agate (also known as Dendritic Agate)

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Moonstone

Adularia / Orthoclase (KAlSi3O8)

Fuchsite

Chrome-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]

Carnelian

Carnelian Chalcedony (SiO2 with iron oxide impurities)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with trace Fe2+)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sunstone (Orthoclase Feldspar variant)

Orthoclase (KAlSi3O8) with inclusions

Chalcedony Nodule (Agate/Chert)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Galena

Lead(II) sulfide (PbS)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz Geode (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Agate (specifically Waterline or Onyx-type Agate)

Silicon Dioxide (SiO2) - variety Chalcedony

Obsidian

Obsidian (Volcanic Glass)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Magnetite (Small Granule)

Magnetite (Fe3O4)

Marble

Recrystallized Carbonate Rock (CaCO3)

Sandstone

Arenite (primarily SiO2)

Amethyst

SiO2 (Silicon Dioxide)

Red Quartzite

Quartzite (SiO2)

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Granite (Micro-specimen)

Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Gneiss (Metamorphic Rock)

Gneiss