Entry № 249
Japan Law Twin Quartz
SiO₂ (twin on the {11-22} plane)
Two quartz crystals meeting flat at 84 degrees.
Chakra
Crown · Heart
Element
Air · Storm
Zodiac
Gemini · Libra

I. The Metaphysical Reading
How the stone has been held.
Japan-law twin quartz is worked with as a stone of paired path, held for partnerships, co-parenting and creative duos where two intentions must share one base without either losing its point. It is said to help the carrier hold difference without collapsing it.
- Chakra
- Crown · Heart
- Element
- Air · Storm
- Zodiac
- Gemini · Libra
- Keynote
- Two quartz crystals meeting flat at 84 degrees.
II. The Scientific Reading
What the lattice actually does.
Japan-law (or La Gardette-law) twinning is a rare contact twin of quartz on the {11-22} plane, in which two prismatic crystals share a common face and meet at a re-entrant angle of about 84°33′. The result is a flat, heart-shaped or V-shaped intergrowth first documented from the Otomezaka Mine in Yamanashi, Japan. Because the twin plane requires specific low-temperature hydrothermal conditions, well-formed Japan-law twins are uncommon and highly collected.
- Formula
- SiO₂
- System
- Trigonal (α-quartz, contact-twinned)
- Hardness
- 7 (Mohs)
- Provenance
- Japan (Otomezaka, Yamanashi — classic locality), USA (California), Peru, Namibia, France
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- SiO₂
- Crystal System
- Trigonal (α-quartz, contact-twinned)
- Mohs Hardness
- 7 (Mohs)
- Density
- 2.65 g/cm³
- Refractive Index
- 1.544 – 1.553
- Provenance
- Japan (Otomezaka, Yamanashi — classic locality), USA (California), Peru, Namibia, France
- Color Origin
- Colourless to milky white, occasionally smoky
Related Crystals
Stones that share this lattice
Next in the Atlas
Jaspillite
Red jasper and silver hematite in tectonic ribbons.




