Mineral

Tiger's Eye

Quartz pseudomorph after crocidolite (SiO2)

Greenstone / Epidosite

Epidosite (primary minerals: Epidote and Quartz)

Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Vesicular basalt

Basalt, commonly plagioclase feldspar + pyroxene ± olivine

Azurite Malachite (Mixed)

Azurite-Malachite; Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2

Granite (likely)

Granite, a quartz–feldspar–mica intrusive igneous rock

Granite

Granite (felsic intrusive igneous rock)

Epidote

Epidote, Ca2(Al,Fe)3(SiO4)3(OH)

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Quartz in Greenstone

Metamorphic rock with quartz vein (SiO2 / mixed silicates)

Likely green-schist specimen

Greenschist, a chlorite–epidote–actinolite-bearing metamorphic rock

Quartz (Druzy)

Silicon Dioxide (SiO2)

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Quartz-veined dark volcanic rock (likely basalt)

Basalt with a quartz-rich vein; exact identification requires testing

Rhodochrosite

Manganese carbonate (MnCO3)

Fluorite on Matrix

Calcium Fluoride (CaF2)

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)

Blue Howlite (Dyed)

Dyed Howlite (Calcium Borosilicate Hydroxide, Ca2B5SiO9(OH)5)

Sandstone (Ferruginous)

Arenite (SiO2 based with Fe2O3 banding)

Sandstone

Arenite

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Tiger's Eye

Silicon Dioxide (SiO2) with fibrous inclusions

Pegmatite (Feldspar and Quartz)

Pegmatite (KAlSi3O8 / SiO2)

Fluorite

Calcium Fluoride (CaF2)

Banded gneiss

Gneiss, a foliated metamorphic rock; likely quartz–feldspar–mica gneiss

Tumbled greenstone or serpentinite pebble

Likely serpentine-group rock (serpentinite); exact identification is uncertain from the image

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining

Polished orbicular jasper (likely ocean jasper or brecciated jasper)

Microcrystalline quartz (SiO₂), with iron oxides and accessory chlorite/zeolite minerals

Quartz pebble

Silicon dioxide (SiO2)

Likely quartz pebble

Quartz, SiO₂

Granite (with a dark inclusion or attached fragment)

Granite, mainly quartz, feldspar, and mica; the dark object cannot be identified confidently from the photo.

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Ironstone / iron-oxide-rich rock fragment

Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone

Botryoidal chalcedony (likely common opal)

Silica, SiO₂; chalcedony is microcrystalline quartz, while opal is hydrated amorphous silica (SiO₂·nH₂O)

Tumbled basalt pebble

Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and iron-titanium oxides)

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Pegmatitic granite (likely quartz–feldspar rock)

Granitic pegmatite, composed mainly of quartz (SiO₂) and feldspar

Quartz-rich granite pebble

Granite, composed mainly of quartz, feldspar, and mica

Weathered granitic rock fragment

Likely granite or granodiorite; exact identification is uncertain from the image

Small banded metamorphic rock fragment

Indeterminate foliated metamorphic rock; possibly mica schist or gneiss