Granite

Quartz (in a rock matrix)

Quartz (SiO2)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Felsic Igneous Rock (likely Rhyolite or weathered Granite)

Felsic Volcanic/Plutonic Rock

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Gneiss (likely)

Gneiss

Quartz

Silicon Dioxide (SiO₂)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Banded Gneiss

Gneiss (pronounced "nice")

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Bi-Color Tourmaline (or Watermelon Tourmaline)

Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Rose Quartz

Rose Quartz (SiO₂)

Quartz (pebble)

Quartz (SiO₂)

Smoky Quartz

SiO2 (Silicon Dioxide)

Citrine

Quartz (SiO2) - variety Citrine

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Garnet (likely Almandine, Pyrope, or a blend)

Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Gneiss

Gneiss (pronounced 'nice')

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Quartz

Quartz (SiO2, Silicon Dioxide)

Smoky Quartz

Quartz (SiO₂)

Quartz (milky quartz variety)

Quartz (SiO₂)

Kunzite

Spodumene, LiAlSi2O6 (variety of spodumene)

Beryl (Variety Mix)

Be3Al2(Si6O18)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Quartz (Druzy) in host rock

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

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)

Clear Quartz (beads in a bracelet)

Quartz (SiO2)

Banded Gneiss

Gneiss (pronounced 'nice')

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Peridot and Citrine Gemstones (in a ring setting)

Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)

Aquamarine and clear quartz

Aquamarine (Be3Al2Si6O18), Quartz (SiO2)

Jasper and Aquamarine (likely)

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

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Quartz

SiO₂ (Silicon Dioxide)

Rock Crystal Quartz

Quartz (SiO₂)