Sedimentary Or Igneous

Pyrite

Iron Sulfide (FeS2)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary or Igneous Matrix

Quartz Geode

Silicon Dioxide (SiO2) within Sedimentary or Igneous host

Quartz Geode

Silicon Dioxide (SiO2) within a sedimentary or igneous host

Geode (Unopened)

Quartz/Chalcedony concretion

Garnet

Garnet (X3Y2(SiO4)3)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Garnet Gneiss

Garnetiferous quartzo-feldspathic gneiss

Small weathered mineral/rock fragment

Uncertain from image; possibly quartz-rich sandstone or a feldspar-bearing rock

Geode

Quartz / Chalcedony nodule

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Garnet Gneiss

Gneiss containing Almandine Garnet

Geode

Quartz / Chalcedony nodule

Quartz Geode / Druzy Quartz Node

Silicon Dioxide (SiO2)

Garnet in Host Rock

Garnet Group (A3B2(SiO4)3)

Gneiss

Gneiss (Metamorphic Rock)

Quartz Geode

Silicon Dioxide (SiO2)

Opal

Hydrated Silica (SiO2·nH2O)

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous schist/gneiss; composition likely quartz, feldspar, mica, and altered mafic minerals

Geode

Quartz nodule / Chalcedony-lined cavity

Fluorite Bracelet

Calcium Fluoride (CaF2)

Weathered schist or gneiss fragment

Quartz–feldspar–mica metamorphic rock; likely mica schist or gneiss

Gneiss (with Garnet)

Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Healer's Gold (Pyrite and Magnetite in Schist)

Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist

Unopened Geode

Geode (containing various mineralization like Quartz SiO2)

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Quartz-veined Metamorphic Pebble

Silicate-rich metamorphic rock with quartz veins (SiO2)

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode form

Quartz (Moss-covered)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz Geode

Silicon Dioxide (SiO2)

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Weathered quartz-rich metamorphic rock, likely gneiss or quartzite

Quartz (SiO₂)-bearing gneiss; exact identification requires a fresh surface and tests

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Red Garnet (likely Almandine or Pyrope)

Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)

Quartz Vein in Schist

Quartz-rich Micaceous Schist (SiO2 + phyllosilicates)

Geode

Silicon Dioxide (Quartz/Chalcedony) in carbonate or volcanic host rock