Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Ruby in Zoisite

Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with various inclusions

Rose Quartz

Rose Quartz (SiO2)

Rose Quartz

Rose Quartz (SiO₂)

Marble

Metamorphosed Limestone/Dolomite

Quartz (River-worn Pebble)

Quartz (SiO2)

Quartz Geode/Druzy Quartz

Quartz (SiO₂)

Quartz

Silicon dioxide (SiO₂)

Kunzite

Spodumene, LiAlSi2O6 (variety of spodumene)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Quartzite

Quartzite (primarily SiO₂)

Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)

SiO2 with TiO2 inclusions (Quartz with Rutile)

Smoky Quartz

SiO2 (Silicon Dioxide)

Quartzite

Quartzite

Gneiss (likely)

Gneiss

Green Aventurine

Aventurine (a variety of Quartz, SiO2)

Chevron Amethyst

Quartz (SiO2) with patterned Amethyst and White Quartz/Milky Quartz

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Lapis Lazuli

A metamorphic rock primarily composed of lazurite (Na,Ca)8[(S,SO4,Cl)2|(Al6Si6O24)], calcite (CaCO3), and pyrite (FeS2).

Diamond (Rough)

Diamond (C)

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Rutilated Quartz

SiO2 (Quartz) with TiO2 (Rutile inclusions)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Banded River Rock / Gneiss (highly weathered)

Gneiss

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)

Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.

Calcite

Calcite (CaCO3)

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Banded Gneiss

Gneiss (pronounced 'nice')

Ruby in Zoisite

Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende

Diamond

Diamond (carbon allotrope), C (chemical formula)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Beryl (Variety Mix)

Be3Al2(Si6O18)

Calcite

Calcite (CaCO3)

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite (Pink/Red variety)

Quartzite (SiO2 with iron oxide impurities)

Quartzite

Quartzite (primarily SiO2)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with miscellaneous inclusions