Synthetic (Man Made Material Mimicking Natural Stone)

Sandstone

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

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartzite

Quartzite (primarily SiO2)

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Rose Quartz

SiO2 (Silicon Dioxide with trace amounts of titanium, iron, or manganese)

Rose Quartz

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

Sandstone

Sandstone (clastic sedimentary rock)

Jasper and Aquamarine (likely)

Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))

Citrine Geode (or Druzy Citrine)

Silicon Dioxide (SiO₂) - a variety of Quartz

Smoky Quartz

SiO2 (Silicon Dioxide)

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Schist

Schist (various compositions)

Petrified Wood

Silicified wood (Quartz/Chalcedony)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartzite

Quartzite (primarily SiO2)

Granite

Granite (a common term for a felsic intrusive igneous rock)

Malachite

Malachite (Cu2CO3(OH)2)

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Peridot (Olivine)

Olivine, (Mg,Fe)2SiO4

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Pyrite

Iron Pyrite (FeS₂)

Granite (tumbled pebble)

Granite (Plutonic Igneous Rock)

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

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)

Granite

Granite (felsic intrusive igneous rock)

Serpentinite

Serpentinite

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Banded Agate (variety of Chalcedony)

Agate (SiO2)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Peridot

Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

Pyrite

Pyrite (Iron Disulfide), FeS2

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Chert (often referred to as 'Jasper' when red)

Chert (microcrystalline quartz, SiO₂)

Granite

Granite (a plutonic igneous rock)

Fuchsite Quartzite

Fuchsite-bearing Quartzite

Granite

Granite (a felsic intrusive igneous rock)