Mineral, Specifically A Rock Fragment

Orange Calcite

Calcium Carbonate (CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Garnet (specifically Almandine or Pyrope)

Almandine: Fe3Al2(SiO4)3 or Pyrope: Mg3Al2(SiO4)3

Chalcedony (specifically Agate or Carnelian pebble)

Chalcedony (Microcrystalline Quartz, SiO2)

Chalcedony (specifically Agate or Moonstone-like Quartz)

Silicon Dioxide (SiO2)

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Chert (Black Chert/Flint)

Chert (Silicon Dioxide, SiO2)

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)

Jasper (Green Jasper/Chert)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky/Opaque variety)

Silicon Dioxide (SiO2)

Septarian Nodule (Yellow Jasper variety)

Septarian Nodule (comprising Calcite, Aragonite, and Limestone/Bentonite)

Quartz (Small fragments)

Silicon Dioxide (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides

Moonstone (specifically Rainbow Moonstone / White Labradorite)

White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)

Chert (specifically Gray Chert)

Chert (SiO2)

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) matrix containing Rugosa (order of extinct solitary and colonial corals)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Coquina / Fossiliferous Limestone

Coquina (composed primarily of Calcium Carbonate / CaCO3)

Carnelian Agate/Jasper blend

Silicon Dioxide (SiO2) - variety of Chalcedony

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Pietersite

Brecciated Chatoyant Tiger's Eye (SiO2)

Aventurine (specifically Green Aventurine)

Silicon Dioxide (Quartz) with inclusions of Fuchsite; SiO2 + K(Al,Cr)2AlSi3O10(OH)2

Orange Calcite

Calcium Carbonate (CaCO3)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert Nodule

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (or Flint)

Chert (microcrystalline or cryptocrystalline quartz, SiO2)

Pink Granite

Granite (Alkali-feldspar granite)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Plagioclase Feldspar (specifically Albite/Oligoclase)

(Na,Ca)(Si,Al)4O8

Moonstone (specifically White Moonstone/Adularia)

Potassium aluminum silicate ((K,Na)AlSi3O8)

Garnet (specifically Almandine or Pyrope)

Almandine (Fe3Al2Si3O12) or Pyrope (Mg3Al2Si3O12)

Chalcedony (specifically Agate or Water-worn Quartzite)

Silicon Dioxide (SiO2)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Green Calcite

Calcium Carbonate (CaCO3)

Gneiss (specifically Banded Gneiss)

Gneiss

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions