Johachidolite Locality: Pein Pyit (Painpyit), Mogok , Sagaing District, Mandalay Division , Burma (Myanmar) ( Locality at mindat.org ) Size: 3.5 x 3.0 x 1.6 cm. Johachidolite is a calcium aluminum borate and this specimen is an incredible rarity of size and stature that makes it among the more important rare species specimens from this part of the world. This crystal is exceptionally large. Ex. William Larson Collection. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Johachidolite
Johachidolite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula CaAlB₃O₇.
It crystallizes in the orthorhombic crystal system (space group Cmma).
Key properties: Mohs hardness 7.5; specific gravity 3.37–3.45; Vitreous luster; optically biaxial.
IMA symbol Jhd, IMA status: approved, named in 1942.
Found in a nepheline dike cutting limestone (Johachido district, North Korea).
It is found associated with Scapolite, diopside, albite, nepheline, apatite, phlogopite (Johachido district, North Korea).
The name refers to the Johachido district, North Korea, which produced the first specimens.