Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

Granite (specifically Red Granite)

Phaneritic Plutonic Rock (High in Alkali Feldspar and Quartz)

Unakite

Unakite (Epidotized Granite)

Serpentine (Nephrite-like Serpentine)

Serpentinite (Hydrous magnesium iron phyllosilicate)

Quartzite

Quartzite (SiO2)

Unakite

Epidotized Granite

Serpentine

Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4

Unakite

Epidotized Granite (SiO2, KAlSi3O8, Ca2(Al, Fe)3(SiO4)3(OH))

Green Calcite

Calcium Carbonate (CaCO3)

Yellow Quartzite

Quartzite (primarily SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Iron-stained Quartzite

Metamorphic Quartz (SiO2) with limonite/hematite staining

Quartzite

Quartzite (primarily SiO2)

River Pebble (Quartzite/Chert)

Quartzite with inclusions (SiO2)

Unakite

Epidotized Granite

Malachite Coating on Host Rock

Malachite [Cu2CO3(OH)2]

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Clear Quartz Cluster

Quartz (Silicon Dioxide - SiO2)

Chert (and Flint variant)

Chert (SiO2)

Granitic Pegmatite

Granitic Pegmatite with Quartz and Feldspar

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Ironstone Concretion

Siderite or Limonite Concretion

Diorite (River Pebble)

Phaneritic Intermediate Plutonic Rock (Diorite)

Granite

Course-grained intrusive igneous rock

Garnet (Almandine or Spessartine likely)

Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Quartz Geode/Cluster

Quartz (SiO2)

Quartzite Pebble

Quartzite (SiO2 with minor impurities)

Chert (Iron-stained)

Chert (Microcrystalline Quartz, SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Conglomerate

Clastic sedimentary rock (Conglomerate)

Quartzite

Quartzite (primarily SiO2)

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Ruby in Fuchsite (often confused with Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2)

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Garnet (specifically Almandine or Pyrope)

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

Green Jasper

Jasper (variety of Microcrystalline Quartz, SiO2)