Granite

Schist

Schist (various mineral compositions)

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Quartz

Silicon Dioxide (SiO2)

Quartz (in matrix)

Quartz (SiO₂)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Felsic Igneous Rock (likely Rhyolite or weathered Granite)

Felsic Volcanic/Plutonic Rock

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Bi-Color Tourmaline (or Watermelon Tourmaline)

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

SiO2 (Silicon Dioxide)

Gneiss (likely)

Gneiss

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.

Rose Quartz

Rose Quartz (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 (typically quartz, feldspar, mica, amphibole composition)

Banded Gneiss

Gneiss (pronounced "nice")

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Quartz

Silicon Dioxide (SiO₂)

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.

Citrine

Quartz (SiO2) - variety Citrine

Kunzite

Spodumene, LiAlSi2O6 (variety of spodumene)

Smoky Quartz

Quartz (SiO₂)

Quartz (milky quartz variety)

Quartz (SiO₂)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Beryl (Variety Mix)

Be3Al2(Si6O18)

Quartz (pebble)

Quartz (SiO₂)

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)

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')

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 (variety of colors)

SiO2 (Silicon Dioxide)