Organic Gem Material (Botanical)

Limonite (Iron Ore)

Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)

Jasper

Silicon dioxide (SiO2)

Pink Banded Onyx (Mexican Onyx / Calcite)

Calcite (CaCO3) - microcrystalline calcium carbonate

Fluorite (Green Fluorite)

Calcium Fluoride (CaF2)

Painted Pet Rock (Quartzite/Sandstone base)

Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments

Chert (specifically Red Chert/Jasper)

Microcrystalline Quartz (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

Agate (Nodule/Chert)

Silicon Dioxide (SiO2)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Crushed Limestone

Calcium Carbonate (CaCO3)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

River Stone (likely Mudstone or Siltstone)

Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Diamond

Native Carbon (C)

Diamond

Diamond (pure Carbon, C)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Diamond

Native Carbon (C)

Diamond

Native Carbon (C)

Pink Jade (Dyed Quartzite)

Silicon Dioxide (SiO2) - primarily Quartzite or Quartz

Pumice (specifically a water-worn, weathered variety)

Vesicular volcanic glass

Ocean Jasper Mushroom

Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)

Breccia

Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)

Quartz (Milky or Cloudy Quartz)

Quartz (Silicon Dioxide, SiO2)

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Stromatolite

Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Chert (specifically Jasper/Flint pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Chert (River Pebble)

Microcrystalline quartz (SiO2)

Chert (specifically Chert Nodule/Flint)

Chert (Silicon Dioxide, SiO2)

Limestone (Concretionary or Tufa)

Calcium Carbonate (CaCO3)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Picture Jasper

Silicon Dioxide (SiO2) - Opaque Chert/Quartzite variety

Chert / River Pebble

Microcrystalline Silica (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)