Sedimentary (Microcrystalline Silicate)

Green Aventurine

Aventurine Quartz (SiO2 with fuchsite inclusions)

Banded Agate (variety of Chalcedony)

Agate (SiO2)

Banded Jasper (possibly "Picture Jasper")

Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Jasper (Milky/Cream Variety)

Silicon Dioxide (SiO2) - variety of Chalcedony

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2)

Gossan with Copper Carbonate (Chrysocolla/Malachite)

Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)

Jasper with Hematite (Red Jasper)

Silicon Dioxide with Iron Oxide (SiO2 and Fe2O3)

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Jasper (likely Lake Superior Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chalk

Calcareous Ooze (composed primarily of coccoliths)

African Turquoise (Jasper)

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

Brecciated Jasper

Silicon Dioxide (SiO2) with varying mineral inclusions (Iron Oxide, Hematite, Clay)

Thunderegg (Agate-filled Geode Node)

Silicon dioxide (SiO2) with various inclusions

Banded Iron Formation (BIF)

Banded Iron Formation

Leopard Skin Jasper

Chalcedony (cryptocrystalline Quartz)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color

Silicon Dioxide (SiO2), a variety of Chalcedony

Jasper (likely a variety of Yellow or Mustard Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Turritella Agate (Elimia Agate)

Silicified Elimia tenera (formerly misidentified as Turritella)

Banded Iron Formation (BIF)

Banded Iron Formation

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Quartz (chalcedony variety) or Limestone with Quartz Veins

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

Jasper in Basalt Matrix

Silicon Dioxide (SiO2) with impurities; Chalcedony

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)

Quartz Geode/Cluster

Quartz (SiO2)

Red Jasper (with Quartz Veins)

Jasper (var. chert, SiO₂)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with various inclusions

Fossilized Wood (Petrified Wood)

Silicified Wood (primarily quartz/chalcedony replacing organic matter)

Coal (most likely Bituminous or Anthracite)

Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Green Agate

Silicon dioxide (SiO₂)

Jasper and Aquamarine (likely)

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

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Banded Agate (likely Carnelian Agate or Sardonyx)

Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.

African Turquoise

Teal Jasper (Macro-crystalline Quartz/Sio2 + Inclusions of Copper, Iron, and Manganese)

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Native Sulfur

Sulfur (S8)