Traditionally associated with protection, boundaries and honest self-examination.
Composition
Volcanic glass — silica-rich lava cooled too fast to crystallise
Hardness · Chakra
5–5.5 · Root
Fractures to an edge only nanometres thick — sharper than surgical steel, and still used in some specialist scalpels.
Traditionally associated with protection and grounding, especially the black variety.
Composition
Complex boron silicate with variable aluminium, iron, magnesium, lithium
Hardness · Chakra
7–7.5 · Varies by colour — black for Root, pink for Heart
Tourmaline develops an electric charge when heated or squeezed. Watermelon tourmaline grows pink at the core and green at the rim.
Traditionally linked to grounding, focus and physical steadiness.
Composition
Iron oxide (Fe₂O₃)
Hardness · Chakra
5–6 · Root
Metallic grey on the outside, blood-red as powder — hence the Greek haima, "blood". NASA named a Martian region after it, evidence of past water.
Traditionally the classic travel-protection stone, also linked to plain speech.
Composition
Hydrated copper aluminium phosphate (CuAl₆(PO₄)₄(OH)₈·4H₂O)
Hardness · Chakra
5–6 · Throat
Porous enough to absorb oils and change colour over years of wear — some cultures read that shift as meaningful.
Traditionally linked to transition, intuition and protecting your own energy.
Composition
Calcium sodium aluminium silicate — plagioclase feldspar
Hardness · Chakra
6–6.5 · Third Eye, Throat
The flash — labradorescence — appears only at certain angles, caused by light bouncing off internal layers.