Crystal cabinet
Obsidian
A volcanic glass, not a mineral species: usually rhyolitic lava that cooled too fast to crystallize.
Obsidian is usually black and glassy, breaking with curved, shell-like fractures and edges that go sharper than common sense expects. Mahogany pieces show brown-red patches; sheen pieces show a metallic luster from tiny aligned crystals. Snowflake obsidian is the spotted sibling and has its own entry; a light, warm, molded black shape is often factory glass.
What it actually is
| Name used here | Obsidian |
| Mineral or material | A volcanic glass, not a mineral species: usually rhyolitic lava that cooled too fast to crystallize. |
| Hardness | About Mohs 5 to 5.5. Because it is glass, edges chip sharper than the number suggests. |
| How it forms | When silica-rich lava cools very quickly, crystals do not have time to grow, and the melt freezes as glass. Any sheen or spot comes from later, tiny crystals trying, belatedly, to exist. |
Trade names and mix-ups
Mahogany obsidian, rainbow obsidian, and gold or silver sheen obsidian are color and inclusion variants of the same glass, not separate minerals. Apache tears are small rounded nodules of obsidian, and the name is a piece of American marketing layered on a tragedy it does not explain honestly, so this cabinet uses it only to warn you. Man-made black glass is sold as obsidian often enough to distrust a bubble-filled bargain.
Care
Keep it wrapped. Do not knock pieces together, do not leave bare flakes in a pocket, and do not thermal-shock it with boiling water or a freezer. A cool damp cloth and a dry follow-up are enough for a smooth tumbled piece; skip salt, which does nothing but scratch and invite moisture into cracks. Do not display a raw edge where hands reach in the dark.
Provenance
Obsidian occurs in many volcanic landscapes, and some specific sources matter culturally to living Indigenous nations, especially in the Americas. Buy from the commercial lapidary trade rather than from a roadside cut you cannot justify, and do not confuse a purchased pebble with permission to reenact anyone's religion.
Symbolism
- a wrapped edge
- the sentence you have been avoiding
- mirror as history
- glass that remembers heat
Folklore, only where it exists
Obsidian was a tool stone across many volcanic regions: blades, scrapers, and points, because glass fractures sharper than most rocks people could find. In Mexica religion the obsidian mirror is bound up with Tezcatlipoca, whose name is often translated Smoking Mirror; that is a specific theology, not a party trick, and it is not yours because you bought a tumble. John Dee's black mirror, now in the British Museum, is an Aztec obsidian object later used in Elizabethan spirit-conjuring, which is a second history stacked on the first, not a how-to. Modern shadow-work language is a third thing, a contemporary habit of talk, and it does not treat trauma. The Wilde Altar will not hand you a scrying script. The practice is to wrap the glass, write one true sentence you have been avoiding, and wrap it again.
Cautions
An original practice
The Cloth Wrap
- A tumbled or smoothly polished obsidian, not a raw blade
- A thick cloth
- A notecard and a pen
- A small box or drawer that closes
- 1Unwrap the obsidian onto the cloth on a clear table. If the piece has a fresh chip or a blade-like edge, stop and keep it wrapped; this practice wants a smooth stone.
- 2Write one sentence you have been avoiding. It can be practical: I need a dentist, I owe an apology, I am leaving the job. It does not have to be a confession of your soul.
- 3Read it once. Fold the card. Place the obsidian on the fold only for a moment, as a weight, then lift it.
- 4Wrap the stone fully so no edge can meet a hand in the drawer. Put it in the box.
- 5Put the card where the action is: on the fridge, in the bag, in the envelope. Not under a candle, and not in a bowl of water.
Glass breaks the way glass breaks. I name the thing without asking the dark to answer. Then I wrap the edge.
Close the drawer. Wash your hands if you are not sure whether you met a chip. Do not rinse the stone to complete the practice.
A practical action. Do the next ordinary step the sentence requires: make the call, send the apology, or put the date on a calendar.
Substitutions
- A piece of broken bottle glass, safely wrapped and then discarded rather than kept as a tool
- A square of black paper in place of the stone, if you do not want glass in the house
Beginner questions
- Is obsidian a crystal? It is a glass, not a crystalline mineral. Sellers still call it a crystal. The fracture does not care about the vocabulary.
- Can I scry with it the way an Aztec priest or John Dee did? No. Those are specific histories, and this page will not sell you a reconstructed rite. Looking at a reflection is just looking.
- Is it safe in drinking water if the piece is smooth? No. No elixirs. Glass also chips, and chips in a mouth or a stomach are an emergency, not a ritual.