Mineral Specimen

Basalt (Crushed Stone Aggregate)

Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)

Green Quartzite (River Stone)

Metamorphic Quartz (SiO2) with inclusions (typically Fuchsite or Chlorite)

Fossiliferous Limestone (Gritstone/Marl)

CaCO3 (Calcium Carbonate) with Fossil Inclusions

Chert / Greenstone

Silicon Dioxide (SiO2) with impurities

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Schist with Schorl (Black Tourmaline)

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Mica Schist with Quartz

Mica-Quartz Schist (Muscovite subclass)

Jasper (Petrified Wood Variety)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil

Jasper Conglomerate

Jasperoid Conglomerate (predominantly SiO2 with iron oxide impurities)

Porphyritic Basalt (Chinese Writing Stone or Flower Stone)

Porphyritic Basalt / Porphyry

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)

Amber Chert (Jasper)

Microcrystalline Quartz (SiO2)

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)

Kambaba Jasper (Crocodile Jasper)

Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2

Jasper with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Sorosilicate [Ca2Al2Fe3+Si3O12(OH)]

Snowflake Obsidian

Obsidian with Cristobalite inclusions (70–75% SiO2)

Green Aventurine

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

Jasper

Silicon dioxide (SiO2)

Obsidian

Volcanic Glass (70-75% SiO2)

Fuchsite in Quartz

K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Orbicular Jasper (Ocean Jasper or Poppy Jasper variant)

Silicon Dioxide (SiO2) with various inclusions

Snowflake Obsidian

Volcanic glass with Spherulite inclusions (SiO2)

Fuchsite Gneiss (Green Quartzite)

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)

Jasper

Jasper (Silicon Dioxide, SiO2)

Snowflake Obsidian

Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)

Sandstone with Liesegang Rings

Arenite with secondary Iron oxide (Limonite/Goethite) precipitation

River Cobble (Quartzite)

Meta-orthoquartzite

Jasper

Jasper (Cryptocrystalline Quartz; SiO2)

Banded Sandstone (Liesegang Rings)

Sedimentary sandstone with Iron oxide precipitates

Gneiss (specifically a water-worn pebble)

Gneiss

Diorite (River Pebble)

Phaneritic Intermediate Plutonic Rock (Diorite)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Jasper with Quartz Druzy

Silicon Dioxide (SiO2)

Chert (including varieties like Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Basalt (River Pebble)

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

Basalt River Stone

Basalt (Mafic volcanic rock)