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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

Japan Law Twin Quartz

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

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Next in the Atlas

Jaspillite

Red jasper and silver hematite in tectonic ribbons.