Minerals

Botryoidal Hematite (Iron Stone Conglomerate)

Hematite (Fe2O3) in sedimentary matrix

Iron-stained quartz (likely quartz vein material)

Quartz, SiO₂, with iron-oxide staining (commonly goethite and/or hematite)

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Lepidolite

K(Li,Al)3(Al,Si,3O10)(F,OH)2

Feldspar

Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz-rich pegmatite

Granitic pegmatite composed mainly of quartz, with probable feldspar and mica

Milky quartz

Quartz (silicon dioxide, SiO₂)

Polished mineral point (possibly milky quartz)

Likely quartz, SiO₂; exact identification is uncertain from the image

Orange-yellow mineral fragment (possibly sulfur)

Unidentified; color suggests native sulfur (S), but the image is insufficient for confident identification

Small brown mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks visible diagnostic features for reliable identification

Small brown mineral or rock fragment

Undetermined; the image lacks enough detail for a reliable identification

Yellow-brown stone or mineral fragment

Unidentified; the image does not show enough detail for a reliable identification

Likely quartz-rich rock or mineral fragment

Quartz (SiO₂), possibly in a pegmatitic or granitic matrix

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Quartz with iron-oxide staining

Quartz (SiO₂), likely with limonite/goethite staining and possible mica or other dark inclusions

Chakra Crystal Bracelet

Mixed Mineral Assortment

Milky quartz

Quartz (SiO₂)

Limonite Concretion

Hydrated Iron Oxide-Hydroxide, FeO(OH)·nH2O

Limonite/Goethite Concretion

Goethite (FeO(OH))

Weathered granite pebble

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

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)·nH2O

Malachite

Copper Carbonate Hydroxide, Cu2CO3(OH)2

Turquoise in Matrix

Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O

Limonite Nodule

Limonite (FeO(OH)·n(H2O))

Turquoise

Copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O

Porphyritic volcanic rock (likely andesite or basaltic andesite)

Porphyritic andesite/basaltic andesite; mainly plagioclase, pyroxene, and possibly olivine in a fine volcanic groundmass

Quartz Pebble

Silicon Dioxide (SiO2)

Vesicular basalt with secondary crystals

Basalt, likely zeolite- or calcite-lined vesicular basalt

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Pegmatite Granite

Intrusive Igneous Rock

Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Feldspar (Microcline / Orthoclase)

Potassium Feldspar (KAlSi3O8)

Quartz

Silicon dioxide (SiO2)

Chrysocolla

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O

Diorite

Plutonic Igneous Rock (NaAlSi3O8, CaAl2Si2O8)

Green Quartz

Silicon Dioxide (SiO2)

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz in Granite

SiO2 embedded in felsic intrusive rock