Man Made Rock Like Material

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Beach Quartzite Pebble

Quartzite (primarily SiO2)

Rhyolitic Tuff

Rhyolitic Tuff / Pyroclastic rock

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz Conglomerate

Quartz Conglomerate (clastic sedimentary rock)

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Pumice

Pumice (volcanic glass with vesicular texture)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Sandstone

Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Chert (Iron-rich or Jasperoid)

Cryptocrystalline Quartz (SiO2)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Tufa

Calcareous Tufa (CaCO3)

Serpentinite

Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Mookaite Jasper

Silicified Radiolarite (Silicon Dioxide: SiO2)

Chert (variant of Flint)

Chert (SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with Iron impurities)

Quartz

Quartz (SiO₂)

Chert (Brecciated or Veined)

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Chert (varietal: Jasper or Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chlorastrolite (Greenstone)

Chlorastrolite (variety of Pumpellyite) - Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2 · H2O

Fulonite (Fulgurite-like)

Fulgurite (SiO2 fused silica/lechatelierite)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Siltstone

Siltstone (fined-grained clastic sedimentary rock)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Banded Chert

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

Sandstone

Arenite (primarily SiO2)

Granite

Granite (composed mainly of Quartz, Feldspar, and Mica)

Slate

Slate (Low-grade foliated metamorphic rock)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)