Sedimentary Rock (Possibly Composed Of Various Minerals)

Oolitic Limestone (Egg Stone)

Oolite (Chemical sedimentary rock, primarily CaCO3)

Rounded gray river pebble, likely fine-grained sandstone or siltstone

Indeterminate clastic sedimentary rock; possibly quartz-rich sandstone or siltstone

Coquina

Bioclastic Limestone

Geode

Quartz / Chalcedony nodule

Jasper

Microcrystalline Quartz (SiO2)

Shale

Laminated Fissile Pelite

Quartz

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Glauconitic Sandstone with possible Trace Fossil

Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Iron-stained Quartz Pebble

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Chert (with Iron Staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Vesicular quartz-rich rock, possibly weathered rhyolite or silicified volcanic breccia

Silica-rich volcanic rock; likely microcrystalline quartz (SiO₂) with altered feldspar and iron-oxide staining

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Magnetite or Magnetic Iron Ore

Magnetite (Fe3O4)

Fluorite with Rhodochrosite

Fluorite (CaF2) and Rhodochrosite (MnCO3)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Druzy Quartz on Milky Quartz

Silicon Dioxide (SiO2)

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

African Turquoise

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

Pink Granite

Granite (composed primarily of potassium feldspar, quartz, plagioclase feldspar, and biotite/amphibole)

Likely limestone or calcareous fossil fragment

Calcite-rich carbonate rock; possibly bioclastic limestone (CaCO₃)

Weathered fine-grained stone, likely sandstone or quartzite

Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

Wishing Rock (Quartz Vein in Host Rock)

Silicon dioxide (SiO2) vein in various host rocks

Chert

Chert (Silica: SiO2)

Botryoidal Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Ironstone Nodules / Siderite Concretion

Siderite (FeCO3) / Ferruginous Septarian Concretion

Jasper

Microcrystalline Quartz (SiO2)

Sandstone (Pebble)

Sandstone (composed mainly of Quartz, SiO2, with feldspar and lithic fragments)

Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Coquina / Shelly Limestone

Bioclastic Limestone (composed of CaCO3)

Likely serpentinized ultramafic rock (serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite

Agate

Chalcedony (SiO2)

Red Jasper (possibly with Agate inclusions)

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz)

Sandstone-based Concrete Fragment

Cementitious Composite with Sedimentary Aggregate

Quartz-rich breccia or vein quartz fragment

Quartz (SiO₂), likely with iron-oxide staining and attached host rock