Black Obsidian
obsidian (amorphous, not a mineral)
Lava that cooled too fast to organise itself into crystals, a natural glass, and the sharpest edge available to any pre-metal culture. Mesoamerican workshops turned it into blades and scrying mirrors; John Dee had one. People carry it for protection, shadow work and grounding. Tradition attaches it to the element fire, the root chakra, Pluto.
Seen · you don't have this one yet
Mineral facts
Hardness
5-6 Mohs
Formula
SiO2 ~70–75% with Al, Na, K, Fe oxides
Family
volcanic glass
Where it comes from
Mexico, USA (Oregon, California, Idaho), Iceland, Italy (Lipari), Turkey, Armenia
What it is
Lava that cooled too fast to organise itself into crystals, a natural glass, and the sharpest edge available to any pre-metal culture. Mesoamerican workshops turned it into blades and scrying mirrors; John Dee had one. It is not a mineral in the strict sense, since it has no crystal structure at all.
What it is confused with
black-onyx, jet, shungite, black-tourmaline, black-glass, hematite
A pure black glass with a mirror-bright vitreous luster and perfectly smooth conchoidal fracture, broken edges are curved, shell-like and razor sharp, with fine ripple lines radiating from the impact point. No crystals, no grain, no cleavage, no internal structure except occasional swirl banding from lava flow. Thin flakes and chipped edges transmit a smoky brown-grey when backlit, which is the fastest confirmation it is glass and not jet or onyx. Warms in the hand faster than quartz.
How to tell
Backlight a thin edge, obsidian glows translucent brown; onyx and jet do not. Obsidian is softer than onyx (5, 6 vs 7) so a quartz pebble will scratch it, and it will not scratch a glass bottle confidently. Jet is far lighter, warm to the touch and leaves a brown streak; obsidian's streak is white.
Natural obsidian is untreated. Manufactured black glass and slag glass are sold as obsidian; look for mould seams, perfectly round bubbles and an unnaturally uniform shape.
What it means for you
The Moon is at 1° Scorpio today. Black Obsidian is a volcanic glass, 5-6 on the Mohs scale, and it is the stone traditionally carried when the problem is proximity rather than intensity.
You know what this one would do for you. You just don't have it.
Black Obsidian for every sign
Aries
Never carry a raw piece loose.
Volcanic glass, cooled too fast to organise itself into crystals, and it takes an edge measured in nanometres. Mesoamerican workshops made blades from it and John Dee scryed into a polished disc of it, which are two very different uses for the same accident. Never carry a raw piece loose.
Taurus
John Dee owned one of the mirrors.
It has no crystal structure at all, which is why mineralogists will not quite call it a mineral. Mesoamerican workshops made blades and scrying mirrors from it. John Dee owned one of the mirrors. It chips into edges that will open a finger, so keep raw pieces off a shelf you reach into.
Gemini
John Dee kept one of these on his desk.
Lava that cooled too fast to organise into crystals, which is why it has no structure at all and breaks into edges sharper than a scalpel. Mesoamerican workshops made blades and scrying mirrors from it, and John Dee kept one on his desk in London. Never carry a raw piece loose.
Cancer
It cooled too fast to become anything at all.
It cooled too fast to become anything. No crystals, no cleavage, no structure at all, just lava frozen mid-decision into a glass that breaks into edges sharper than surgical steel. Aztec and Mixtec workshops polished it into mirrors and looked into it on purpose.
Leo
A mirror with nothing at all behind it.
Mesoamerican workshops polished it into mirrors for divination, and one of those mirrors ended up in John Dee's hands in Elizabethan London. It is glass, lava quenched too fast to organise into crystals, with no internal structure at all. A mirror with nothing behind it.
Virgo
It has no crystal structure, so it is not a mineral.
Lava that cooled too fast to organise into crystals, which means it has no internal structure and is not strictly a mineral. It takes the sharpest edge available to anyone without metal. Backlight a thin chip and it glows smoky brown, ruling out jet and onyx in a single move.
Libra
A mirror returns exactly what you bring to it.
Lava that cooled too fast to organise into crystals, so it has no internal structure at all and breaks into curved edges sharper than surgical steel. Mesoamerican workshops polished it into scrying mirrors and John Dee owned one. A mirror returns exactly what you bring to it.
Scorpio
It gives back your face. There is nothing inside to see.
Lava cooled too fast to organise itself into crystals, so it never acquired a structure at all. Mesoamerican workshops knapped it into blades and polished it into scrying mirrors, and John Dee owned one. It gives you back your own face because there is nothing inside it to look at.
Sagittarius
One of those mirrors ended up with John Dee in London.
Lava cooled too fast to organise into crystals, so it has no crystal structure and is not strictly a mineral. Mesoamerican workshops made blades and scrying mirrors from it, and one of those mirrors ended up with John Dee in London. It still chips into genuinely sharp flakes.
Capricorn
Cooled too fast to organise itself into anything.
It is not, strictly, a mineral. Obsidian is lava that cooled too fast to organise itself into crystals, which leaves it with no internal structure and the sharpest edge available to any culture without metal. Mesoamerican workshops polished it into scrying mirrors, and one of those ended up with John Dee.
Aquarius
It cooled too fast to organise itself into anything.
Lava that cooled too fast to organise itself into anything, so it has no crystal structure and is not strictly a mineral. It breaks to an edge finer than surgical steel. John Dee kept a polished one for scrying and the British Museum still has it.
Pisces
It shows you a surface and nothing behind it.
Glass with no crystal structure anywhere in it, cooled too fast to organise. Mesoamerican workshops polished it into mirrors for divination, and John Dee owned one that sits in the British Museum now. It shows you a surface and nothing behind it.
Correspondences
What tradition attaches to this stone. Folklore, not chemistry.
Element
fire
Planet
Pluto
Chakra
root
Signs
scorpio, capricorn, sagittarius
What tradition says
In crystal lore, black obsidian is associated with unflinching self-examination and with cutting attachments; Aztec and Mixtec tradition used polished obsidian mirrors for divination, and the stone is named for Obsius in Pliny's account.
Care
- Water is fine. Dry it afterwards.
- Chemically inert and water-safe, but physically fragile: it chips into genuinely sharp flakes. Do not carry raw pieces loose in a pocket with other stones.
Common questions
What does black obsidian mean?
Black Obsidian is carried for protection, shadow work and grounding. Lava that cooled too fast to organise itself into crystals, a natural glass, and the sharpest edge available to any pre-metal culture.. Tradition links it to the root chakra.
Is black obsidian real or fake?
Black Obsidian is not faked often, but it is still worth checking. Backlight a thin edge, obsidian glows translucent brown; onyx and jet do not. Obsidian is softer than onyx (5, 6 vs 7) so a quartz pebble will scratch it, and it will not scratch a glass bottle confidently.. Natural obsidian is untreated.
Can black obsidian go in water?
A short rinse is fine for black obsidian, then dry it.
Common · jet black, very dark brown-black, grey-black
Where this leads
This stone belongs to
Related crystals
FOR ENTERTAINMENT AND REFLECTION. NOT MEDICAL, PSYCHOLOGICAL, FINANCIAL OR LEGAL ADVICE. How this works