It is a mineral of the feldspar group, intermediate element in the Celsian-Hyalophane and Hyalophane-Orthose series.
For more information on Hyalophane mineralogy, see Mindat.org->
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Hyalophane
- Translations : Hyalophan, Гиалофан, 钡冰长石, ハイアロフェン
- Synonym : Jaloallofane
- Etymology : Named by Wolfgang Sartorius von Waltershausen, from the Greek ύαλος = "glass" and φαίνεσθαι, "appear", in reference to the transparency of the crystals.
- Discovery: 1855 by Wolfgang Sartorius von Waltershausen
- Type localityLengenbach Quarry, Im Feld (Imfeld; Feld; Fäld), Binn Valley, Wallis (Valais), Switzerland.
Gemological data
- Chemical formula : (K,Ba)[Al(Si,Al)Si2O8]
- Hardness (Mohs) : 6 - 6.5
- Density : 2.81
- Refractive index : nα = 1.542 nβ = 1.545 nγ = 1.547
- Birefingence : 0.005
- Crystal system : Monoclinique
- Group : Feldspaths
- Mineralogical Class : Tectosilicates
