Mineral (Or Mineraloid If Microcrystalline)

Mahogany Obsidian or Red Jasper

Silicon Dioxide with Iron Oxide (SiO2+Fe2O3)

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

Silicon Dioxide (SiO2), a variety of Chalcedony

Jasper

Silicon Dioxide (SiO2) - a variety of Chalcedony (Cryptocrystalline Quartz)

Carnelian

Carnelian (a variety of Chalcedony, which is a microcrystalline quartz, SiO2)

Quartzite

Quartzite (primarily SiO2)

Mixed Tumbled Stones (Mostly Agate, Jasper, and Quartz)

Silicon Dioxide (SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Red Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Red Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO₂)

Chert (Jasper or Flint variant)

Chert (composed of microcrystalline quartz, SiO2)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Chert (or possibly Flint)

SiO2 (Silicon Dioxide)

Tiger's Eye

Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Ironstone Concretion (likely)

Goethite/Hematite/Limonite cemented sediment

Strawberry Quartz

Quartz (SiO2) with inclusions of Goethite or Hematite

Agate Geode

Chalcedony (SiO2 - Silicon Dioxide)

Scoria

Scoria (a vesicular basalt or andesite)

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

Basalt with Mineral Vein (Cobble)

Basalt (with likely Quartz/Calcite vein)

Iron Slag

Vitreous glassy waste (Fe-Si-Al-Ca compounds)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Banded Jasper (Chert)

Silicon Dioxide (SiO2) - variety of Chalcedony

Jasper (likely Lake Superior Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz

Quartz (SiO2 - Silicon Dioxide)

Red Jasper (beads)

Silicon Dioxide (SiO2) with iron inclusions

Chert (variously known as Flint or Microcrystalline Quartz)

Silicon dioxide (SiO2)

Jasper (likely a variety of Brecciated Jasper or a patterned variety)

Silicon dioxide (SiO2)

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Agate (various color varieties)

SiO₂ (Silicon Dioxide)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Brown Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO2)

Chert (variant of Flint)

Chert (SiO2)

Jade (likely Nephrite or Jadeite)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

Banded Iron Formation

Banded Iron Formation (BIF)

Quartz Geode (partially formed/chalcedony with iron staining)

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

Quartz (chalcedony variety) or Limestone with Quartz Veins

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

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Soapstone

Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Chert or Flint (polished/water-worn)

Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.

Geode with Quartz and possibly Jasper/Hematite

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