Organic Gemstone (Not A Rock)

Petrified Dinosaur Bone (Gembone)

Agatized Dinosaur Bone

Chert (Field Pebble)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Quartzite with inclusions

Quartzite

Petrified Wood

Silicified Wood (SiO2)

Moss Agate

Silicon Dioxide with inclusions (SiO2)

Chert (Jasper-like Silicate)

Microcrystalline quartz (SiO2)

Chert (Tan/Brown variety)

Chert (Microcrystalline Quartz, SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and organic impurities

Fossilized Shark Tooth (Fragment)

Elasmobranchii fossil (likely Cretalamna or Squalicorax genus)

Chert (and Petrified Wood)

Silicon Dioxide (SiO2)

Chert (Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Diamond

Diamond (carbon allotrope), C (chemical formula)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Amber with Inclusion

Succiniferous fossil resin (C10H16O)

Amber

Succinate (Fossilized Tree Resin)

Chert (Yellow Chert/Flint)

Silicon Dioxide (SiO2)

Septarian Nodule (Dragon Stone)

Septarian Concretion (CaCO3 with Siderite and Calcite)

Chert (specifically Jasper or Flint variant)

Microcrystalline Quartz (SiO2)

Fossil Coral (Favosites)

Favosites (Order: Tabulata, Phylum: Cnidaria)

Plastic Building Toy (Lego-style piece)

Acrylonitrile Butadiene Styrene (ABS)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Black Marble

Recrystallized Calcite (CaCO3)

Petrified Wood

Silicified Wood (SiO2)

Chert (variant Flint/Jasper)

Microcrystalline Opaline Silica (SiO2)

Peridot (Olivine)

Olivine ((Mg, Fe)2SiO4)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

Banded Chert

Cryptocrystalline Quartz (SiO2)

Bicolor Tanzanite

Zoisite (Ca2Al3(SiO4)3(OH))

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Aquamarine

Beryl (Be3Al2Si6O18)

Gastropod Fossil (Internal Mold)

Phylum Mollusca, Class Gastropoda (Steinkern)

Green Tourmaline

Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)

Beads (likely glass or man-made material)

N/A (artificial material)

Septarian Nodule

Septarian Concretion

Quartz

Silicon dioxide (SiO₂)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Variscite in Matrix

Variscite (AlPO4 · 2H2O)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)