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kennethreitz.org/data/knowledge/crystals-and-gemstones/index.md
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kennethreitz ce93f429a2 Add Knowledge: the vault's reference shelf, crosslinked across the site 
Publish the Obsidian vault's Knowledge folder as /knowledge (881 notes,
67 folders), with a Knowledge item in the nav and footer.

- scripts/import_knowledge.py regenerates data/knowledge from the vault:
  slugged paths, folder notes as index pages, wikilinks resolved to site
  links (or plain text), callouts, highlights, and Dataview tables
  rendered statically. Personal notes are withheld via an exclusion
  list plus a privacy guard.
- tuftecms/core/knowledge.py builds a concept index from note titles and
  aliases. First mentions on ordinary pages link to their Knowledge note
  (capped, never in headings, code, links, or sidenotes); Knowledge pages
  list related notes and where they're mentioned across the site; other
  pages get a Related Knowledge block.
- Knowledge URLs join sitemap.xml (so the sweep test covers them), never
  displace existing legacy slugs, list alphabetically, and mermaid
  diagrams render client-side only on pages that have them.
2026-10-18 20:08:46 -04:00

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---
description: Slow light in stone — the mineral kingdom's answer to the chakras.
source: obsidian-knowledge
---
# Crystals & Gemstones
> *Slow light in stone — the mineral kingdom's answer to the chakras.*
---
Crystals are the mineral kingdom's most ordered form — atoms locked into lattices so regular they grow into geometric solids over geologic time. The metaphysical tradition reads that order as a kind of frequency, each stone carrying a stable signature that can be worked with: to ground, to open the heart, to sharpen the mind, to protect. Whatever one makes of the mechanism, the practice is old and coherent, and it slots cleanly into the correspondence grid the rest of the vault already runs on — every stone answers to a [chakra](/knowledge/chakras), a classical element, and a planet or sign of [Astrology](/knowledge/astrology).
---
## The Stones
| Stone | Chakra | Element | Planet / Zodiac | Mohs |
| --- | --- | --- | --- | --- |
| [Amethyst](/knowledge/crystals-and-gemstones/amethyst) | Third Eye ([Ajna](/knowledge/chakras/ajna)), Crown | [Air](/knowledge/elements/air) | [Jupiter](/knowledge/astrology/planets/jupiter-astrology), [Neptune](/knowledge/astrology/planets/neptune-astrology) / [Pisces](/knowledge/astrology/signs/pisces), [Aquarius](/knowledge/astrology/signs/aquarius) | 7 |
| [Aquamarine](/knowledge/crystals-and-gemstones/aquamarine) | Throat ([Vishuddha](/knowledge/chakras/vishuddha)) | [Water](/knowledge/elements/water) | [Neptune](/knowledge/astrology/planets/neptune-astrology) / [Pisces](/knowledge/astrology/signs/pisces) (March birthstone) | 7.5–8 |
| [Aventurine](/knowledge/crystals-and-gemstones/aventurine) | Heart ([Anahata](/knowledge/chakras/anahata)) | [Earth](/knowledge/elements/earth) | [Venus](/knowledge/astrology/planets/venus-astrology), [Mercury](/knowledge/astrology/planets/mercury-astrology) / [Aries](/knowledge/astrology/signs/aries), [Leo](/knowledge/astrology/signs/leo) | 7 |
| [Black Tourmaline](/knowledge/crystals-and-gemstones/black-tourmaline) | Root ([Muladhara](/knowledge/chakras/muladhara)) | [Earth](/knowledge/elements/earth) | [Saturn](/knowledge/astrology/planets/saturn-astrology) / [Capricorn](/knowledge/astrology/signs/capricorn) | 7–7.5 |
| [Bloodstone](/knowledge/crystals-and-gemstones/bloodstone) | Root ([Muladhara](/knowledge/chakras/muladhara)), Heart ([Anahata](/knowledge/chakras/anahata)) | [Fire](/knowledge/elements/fire) | [Mars](/knowledge/astrology/planets/mars-astrology) / [Aries](/knowledge/astrology/signs/aries), [Pisces](/knowledge/astrology/signs/pisces) | 6.5–7 |
| [Carnelian](/knowledge/crystals-and-gemstones/carnelian) | Sacral ([Svadhisthana](/knowledge/chakras/svadhisthana)) | [Fire](/knowledge/elements/fire) | [Mars](/knowledge/astrology/planets/mars-astrology), [Sun](/knowledge/astrology/planets/sun-astrology) / [Aries](/knowledge/astrology/signs/aries), [Leo](/knowledge/astrology/signs/leo) | 6.5–7 |
| [Citrine](/knowledge/crystals-and-gemstones/citrine) | Solar Plexus ([Manipura](/knowledge/chakras/manipura)) | [Fire](/knowledge/elements/fire) | [Sun](/knowledge/astrology/planets/sun-astrology) / [Leo](/knowledge/astrology/signs/leo) | 7 |
| [Clear Quartz](/knowledge/crystals-and-gemstones/clear-quartz) | Crown ([Sahasrara](/knowledge/chakras/sahasrara)), all | All | The [Sun](/knowledge/astrology/planets/sun-astrology) / all signs | 7 |
| [Fluorite](/knowledge/crystals-and-gemstones/fluorite) | Third Eye ([Ajna](/knowledge/chakras/ajna)), Heart | [Air](/knowledge/elements/air) | [Mercury](/knowledge/astrology/planets/mercury-astrology) / [Capricorn](/knowledge/astrology/signs/capricorn), [Pisces](/knowledge/astrology/signs/pisces) | 4 |
| [Garnet](/knowledge/crystals-and-gemstones/garnet) | Root ([Muladhara](/knowledge/chakras/muladhara)), Sacral ([Svadhisthana](/knowledge/chakras/svadhisthana)) | [Fire](/knowledge/elements/fire) | [Mars](/knowledge/astrology/planets/mars-astrology) / [Leo](/knowledge/astrology/signs/leo), [Scorpio](/knowledge/astrology/signs/scorpio), [Aquarius](/knowledge/astrology/signs/aquarius) | 6.5–7.5 |
| [Hematite](/knowledge/crystals-and-gemstones/hematite) | Root ([Muladhara](/knowledge/chakras/muladhara)) | [Earth](/knowledge/elements/earth) | [Mars](/knowledge/astrology/planets/mars-astrology), [Saturn](/knowledge/astrology/planets/saturn-astrology) / [Aries](/knowledge/astrology/signs/aries), [Aquarius](/knowledge/astrology/signs/aquarius) | 5–6 |
| [Kyanite](/knowledge/crystals-and-gemstones/kyanite) | Throat ([Vishuddha](/knowledge/chakras/vishuddha)), Third Eye ([Ajna](/knowledge/chakras/ajna)) | [Air](/knowledge/elements/air) | [Neptune](/knowledge/astrology/planets/neptune-astrology) / [Aries](/knowledge/astrology/signs/aries), [Taurus](/knowledge/astrology/signs/taurus), [Libra](/knowledge/astrology/signs/libra) | 4.5–7 |
| [Labradorite](/knowledge/crystals-and-gemstones/labradorite) | Third Eye ([Ajna](/knowledge/chakras/ajna)), Throat | [Water](/knowledge/elements/water) | [Uranus](/knowledge/astrology/planets/uranus-astrology) / [Leo](/knowledge/astrology/signs/leo), [Scorpio](/knowledge/astrology/signs/scorpio) | 6–6.5 |
| [Lapis Lazuli](/knowledge/crystals-and-gemstones/lapis-lazuli) | Third Eye ([Ajna](/knowledge/chakras/ajna)), Throat | [Air](/knowledge/elements/air) | [Jupiter](/knowledge/astrology/planets/jupiter-astrology), [Venus](/knowledge/astrology/planets/venus-astrology) / [Sagittarius](/knowledge/astrology/signs/sagittarius) | 5–6 |
| [Malachite](/knowledge/crystals-and-gemstones/malachite) | Heart ([Anahata](/knowledge/chakras/anahata)) | [Earth](/knowledge/elements/earth) | [Venus](/knowledge/astrology/planets/venus-astrology) / [Capricorn](/knowledge/astrology/signs/capricorn), [Scorpio](/knowledge/astrology/signs/scorpio) | 3.5–4 |
| [Moonstone](/knowledge/crystals-and-gemstones/moonstone) | Crown ([Sahasrara](/knowledge/chakras/sahasrara)), Sacral ([Svadhisthana](/knowledge/chakras/svadhisthana)) | [Water](/knowledge/elements/water) | [Moon](/knowledge/astrology/planets/moon-astrology) / [Cancer](/knowledge/astrology/signs/cancer) | 6–6.5 |
| [Obsidian](/knowledge/crystals-and-gemstones/obsidian) | Root ([Muladhara](/knowledge/chakras/muladhara)) | [Fire](/knowledge/elements/fire) / [Earth](/knowledge/elements/earth) | [Saturn](/knowledge/astrology/planets/saturn-astrology), [Pluto](/knowledge/astrology/planets/pluto-astrology) / [Scorpio](/knowledge/astrology/signs/scorpio) | 5–6 |
| [Pyrite](/knowledge/crystals-and-gemstones/pyrite) | Solar Plexus ([Manipura](/knowledge/chakras/manipura)) | [Fire](/knowledge/elements/fire) / [Earth](/knowledge/elements/earth) | [Sun](/knowledge/astrology/planets/sun-astrology), [Mars](/knowledge/astrology/planets/mars-astrology) / [Leo](/knowledge/astrology/signs/leo) | 6–6.5 |
| [Rhodonite](/knowledge/crystals-and-gemstones/rhodonite) | Heart ([Anahata](/knowledge/chakras/anahata)) | [Earth](/knowledge/elements/earth) | [Venus](/knowledge/astrology/planets/venus-astrology), [Mars](/knowledge/astrology/planets/mars-astrology) / [Taurus](/knowledge/astrology/signs/taurus) | 5.5–6.5 |
| [Rose Quartz](/knowledge/crystals-and-gemstones/rose-quartz) | Heart ([Anahata](/knowledge/chakras/anahata)) | [Water](/knowledge/elements/water) | [Venus](/knowledge/astrology/planets/venus-astrology) / [Taurus](/knowledge/astrology/signs/taurus), [Libra](/knowledge/astrology/signs/libra) | 7 |
| [Selenite](/knowledge/crystals-and-gemstones/selenite) | Crown ([Sahasrara](/knowledge/chakras/sahasrara)) | [Air](/knowledge/elements/air) | [Moon](/knowledge/astrology/planets/moon-astrology) / [Taurus](/knowledge/astrology/signs/taurus) | 2 (very soft) |
| [Smoky Quartz](/knowledge/crystals-and-gemstones/smoky-quartz) | Root ([Muladhara](/knowledge/chakras/muladhara)) | [Earth](/knowledge/elements/earth) | [Saturn](/knowledge/astrology/planets/saturn-astrology) / [Capricorn](/knowledge/astrology/signs/capricorn), [Scorpio](/knowledge/astrology/signs/scorpio) | 7 |
| [Sodalite](/knowledge/crystals-and-gemstones/sodalite) | Throat ([Vishuddha](/knowledge/chakras/vishuddha)), Third Eye ([Ajna](/knowledge/chakras/ajna)) | [Air](/knowledge/elements/air) | [Jupiter](/knowledge/astrology/planets/jupiter-astrology) / [Sagittarius](/knowledge/astrology/signs/sagittarius) | 5.5–6 |
| [Tiger's Eye](/knowledge/crystals-and-gemstones/tigers-eye) | Solar Plexus ([Manipura](/knowledge/chakras/manipura)) | [Fire](/knowledge/elements/fire) / [Earth](/knowledge/elements/earth) | [Sun](/knowledge/astrology/planets/sun-astrology), [Mars](/knowledge/astrology/planets/mars-astrology) / [Leo](/knowledge/astrology/signs/leo), [Capricorn](/knowledge/astrology/signs/capricorn) | 7 |
| [Turquoise](/knowledge/crystals-and-gemstones/turquoise) | Throat ([Vishuddha](/knowledge/chakras/vishuddha)) | [Air](/knowledge/elements/air) | [Venus](/knowledge/astrology/planets/venus-astrology), [Neptune](/knowledge/astrology/planets/neptune-astrology) / [Sagittarius](/knowledge/astrology/signs/sagittarius), [Scorpio](/knowledge/astrology/signs/scorpio) | 5–6 |
---
## Related
- [Chakras](/knowledge/chakras) — the energy centres the stones answer to
- [Astrology](/knowledge/astrology) — planetary and zodiacal rulers
- [Alchemy](/knowledge/alchemy) — the mineral kingdom and the philosopher's stone
- [Knowledge Hub](/knowledge)
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