Mineral (Man Modified)

Porphyritic Basalt or Diabase with Plagioclase Phenocrysts

Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Onyx Marble (also commonly called Onyx)

Calcite (CaCO3), often with other mineral impurities

African Turquoise

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

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Granite

Granite (a plutonic rock)

Obsidian

Obsidian (volcanic glass)

Green Sea Glass

Amorphous Silica (man-made glass), SiO2 + additive metal oxides

Selenite

Gypsum (CaSO4·2H2O), specifically the crystalline variety Selenite

Coral (Precious Coral)

Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).

Chert / Flint

Chert (varieties include Flint)

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Bumblebee Jasper

Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

Soapstone

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

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Pebble

Clast (specifically a granule or small pebble)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Amethyst Geode

Quartz (SiO₂) with iron impurities

Serpentine

Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)

Cobaltoan Calcite / Pink Dolomite (Possible)

Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))

Emerald

Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Chert (or Flint)

Silicon dioxide (SiO2)

Scoria (Volcanic Rock)

Scoria (often basaltic scoria)

Marble

Metamorphosed Limestone/Dolomite

Sandstone

Sandstone (Clastic Sedimentary Rock)

Quartzite

Quartzite (primarily composed of SiO O₂)

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

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

Chert (microcrystalline quartz)

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartzite

Quartzite

Red Coral

Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives