Identify any rockfrom a photo.

Black onyx-style bead bracelet

Likely polished black chalcedony (microcrystalline quartz, SiO₂); the beads may also be dyed agate or another black stone.

Likely biotite-rich mica schist

Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂); exact identification from image is uncertain

Beaded bracelet with black and white stone beads

The white beads may be howlite (Ca₂B₅SiO₉(OH)₅); the glossy black beads cannot be identified confidently from the image and may be obsidian, onyx, or another material.

Likely iron-rich metamorphic rock (possibly hematite-rich ironstone)

Uncertain from the image; possible hematite-bearing ironstone, chiefly Fe₂O₃ with associated silicate minerals

Gemstone stud earrings, likely set with clear stones

The stones may be diamond (carbon, C) or colorless cubic zirconia (ZrO₂); the image is insufficient to distinguish them.

Diamond stud earrings

Diamond, crystalline carbon (C)

Banded fluorite pebble (likely)

Fluorite, CaF₂

Blue apatite crystals

Apatite group, commonly fluorapatite (Ca₅(PO₄)₃F)

Small blue cut gemstone, possibly synthetic spinel or glass; species cannot be determined from the photo

Undetermined; blue synthetic spinel (MgAl₂O₄) is one possibility

Red jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored red by iron oxides

Banded agate (polished/tumbled)

Microcrystalline quartz, SiO₂; likely banded chalcedony

Banded quartz-rich rock (possibly pegmatite)

Likely quartz–feldspar pegmatite; identification is tentative from the photo