Sedimentary Or Igneous (Secondary Formation)

Amygdaloidal Basalt with Epidote

Vesicular Basalt with secondary Epidote/Quartz mineral infill

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Milky Quartz with inclusions

Quartz (Silicon Dioxide, SiO2)

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Limestone (Cliff Formation)

Limestone (predominantly CaCO3 as calcite)

Banded Sandstone (Liesegang Rings)

Sedimentary sandstone with Iron oxide precipitates

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Quartz Geode in Chert/Limestone Matrix

Silicon Dioxide (SiO2) within Sedimentary Host Rock

Agate Geode

Silicon Dioxide (SiO2) - variety Chalcedony/Quartz

Limonite and Goethite encrusted Chert/Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)

Travertine

Terrestrial Sedimentary Rock (CaCO3)

Lepidolite

K(Li,Al)3(Al,Si)4O10(F,OH)2 (Lithium-bearing phyllosilicate)

Prehnite

Prehnite Ca2Al2Si3O10(OH)2

Rhodonite

Rhodonite (MnSiO3)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Amazonite

Amazonite / Microcline (KAlSi3O8)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Obsidian (likely Golden Sheen Obsidian or Rainbow Obsidian, given the subtle sheen visible on some beads)

Obsidian (volcanic glass, predominantly SiO2 with various impurities)

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Ironstone Nodules / Siderite Concretion

Siderite (FeCO3) / Ferruginous Septarian Concretion

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Chert (varieties include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint when in chalk or limestone)

Silicon Dioxide (SiO₂)

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

Chalcedony (specifically Agate or Common Opal variety)

Cryptocrystalline Silica (SiO2)

Chalcedony (Botryoidal/Drusy Quartz)

Silicon Dioxide (SiO₂)

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Pink Granite

Granite (Alkali-feldspar granite)

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Brecciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Shattuckite (Blue Quartz/Jasper Matrix)

Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Granite

Phaneritic Plutonic Felsic Rock (KAlSi3O8 - SiO2 - NaAlSi3O8)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Spondylus Oyster Calcification / Fossilized Oyster

Spondylus (Thorny Oyster) / Calcium Carbonate (CaCO3)