Man Made Metamorphic Style Composite

Yellow Agate

Agate (Microcrystalline Silicon Dioxide, SiO2)

Serpentine-rich pebble

Serpentinite; chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and minor olivine/pyroxene

Quartz vein rock with iron-stained matrix

Quartz (SiO₂), likely with limonite/goethite and minor feldspar or mica

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Citrine (Raw)

Silicon Dioxide (SiO2) with iron impurities

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Gneiss Pebble

Gneiss

Gneiss

Gneiss

Granodiorite

Granodiorite

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)

Ruby in Zoisite

Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende

Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)

Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Gneiss

Gneiss (pronounced 'nice')

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz

Silicon Dioxide (SiO2)

Tumbled blue-green stone, likely chrysocolla or dyed chalcedony

Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Raw Diamond (Rough Uncut)

Diamond (C - pure carbon)

Mixed Agate and Lapis Lazuli Bracelet

Chalcedony (SiO2) and Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Jasper (Imperial Jasper style)

Silicon Dioxide (SiO2) with impurities

Quartzite pebble

Quartzite (SiO2)

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Banded sandstone pebble

Quartz-rich lithic sandstone; exact provenance and composition require testing

Gneiss

Gneiss (a metamorphic rock)

Quartzite (Iron-stained)

Quartzite (SiO2 with iron oxides)

Quartz

Silicon Dioxide (SiO2)

Massive Quartz with Host Rock

Silicon Dioxide (SiO2)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

Probable serpentinite (serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite and olivine remnants

Quartzite

Quartzite (primarily SiO2)

River Rock (Granitic Gneiss)

Foliated Granitic Gneiss

Given the appearance, it's likely a fragment of an igneous or metamorphic rock composed of multiple minerals. Without specific diagnostic features, it's difficult to give a common name other than 'crystalline rock fragment'. If pressed to guess based on the granular, somewhat light and dark speckled appearance, it could be a fragment of granite or a related intrusive igneous rock.

As a rock fragment, it does not have a single scientific mineral name; rather, it's a piece of a rock which is a combination of minerals. If it were granite, its main mineral composition would be quartz (SiO2), feldspar (e.g., KAlSi3O8 - orthoclase, (Na,Ca)(Al,Si)4O8 - plagioclase), and mica (e.g., KAl2(AlSi3O10)(OH)2 - muscovite or K(Mg,Fe)3AlSi3O10(OH)2 - biotite), among others.

Chert / Flint

Chert (varieties include Flint)