IMA mineral species

Chiyokoite

Ca3Si(CO3)[B(OH)4]O (OH)5·12H2O

Hydrous borate mineral.

Chiyokoite specimen — Chiyokoite.jpg · Wikimedia Commons (see file page for author & license)

Properties

Chemical formula	Ca3Si(CO3)[B(OH)4]O (OH)5·12H2O
Elements	Ca, Si, C, O, B, H
Crystal system	Hexagonal
Mohs hardness	—
Density	—
Streak	—
Color	—
IMA symbol	Cyo

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

🌍 Where it's found

Type locality (where it was first described): Fuka mine, Japan

Type locality
Notable source / deposit
Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.

Learn more

Chiyokoite on Mindat.org
Wikidata item Q80184018 (source of this page's data – you can correct it there)