Man Made Glass

Peridot (likely, given the color and bead form)

Olivine, variety Peridot (Mg,Fe)2SiO4

Banded Gneiss

Gneiss (variable mineral composition)

Granite (tumbled pebble)

Granite (Plutonic Igneous Rock)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Rose Quartz (SiO₂)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Sugilite

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

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Granite

Granite (a plutonic igneous rock)

Citrine

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Rock Crystal Quartz

Quartz (SiO₂)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Calcite

Calcite (Calcium Carbonate, CaCO3)

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)

Red Jasper or Chert

Jasper (SiO2, a variety of chalcedony with iron oxide impurities), Chert (SiO2)

Ruby

Corundum (Al₂O₃) with Chromium (Cr)

Peridot

Olivine (Mg,Fe)2SiO4

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Granite (weathered/river-tumbled)

Granite (Plutonic Igneous Rock)

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Amethyst

Quartz (SiO2) with trace iron impurities

Rose Quartz

Quartz (SiO2) with trace impurities causing pink color

Quartz

Quartz (SiO2, Silicon Dioxide)

Halite

Halite (NaCl)

Quartz Crystal

Quartz (SiO₂)

Banded Chert

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

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

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)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Fluorite (likely)

Calcium Fluoride (CaF2)

Rose Quartz

Rose Quartz (SiO2)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Green Aventurine

Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)

Rutilated Quartz

Quartz (SiO2) with Rutile inclusions (TiO2)

Sandstone

Arenite or Sandstone

Diamond

Diamond (pure carbon; C)