Hellandite-(Ce) Mineral Data

General Hellandite-(Ce) Information
Chemical Formula:	(Ca3REE)4Ce2Al[ ]2[Si4 B4O22](OH)2
Composition:	Molecular Weight = 1,114.02 gm
	Calcium 10.79 % Ca 15.10 % CaO
	Cerium 25.15 % Ce 29.46 % Ce₂O₃
	La,Ce,Pr,Nd,Sm, 12.93 % RE 15.08 % REE₂O₃
	Aluminum 2.42 % Al 4.58 % Al₂O₃
	Silicon 10.08 % Si 21.57 % SiO₂
	Boron 3.88 % B 12.50 % B₂O₃
	Hydrogen 0.14 % H 1.21 % H₂O
	Oxygen 33.75 % O
	Fluorine 0.85 % F 0.85 % F
	- % F -0.36 % -O=F₂
	______ ______
	100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:	Ca₃REECe₂AlSi₄B₄O₂₂(OH)_1.5F_0.5
Environment:	Occurs in miarolitic cavities in a volcanic ejectum within an explosive breccia. (hellandite group; structure)
IMA Status:	Approved IMA 2001 (Dana # Added)
Locality:	Pyroclastic flow unit (ignibrite "C") of the Vico volcanic complex near Capranica (Viterbo Province), north of Rome, Italy. Link to MinDat.org Location Data.
Name Origin:	Named for Amund Theodor Helland (1846-1918), geologist of Oslo, Norway.
Name Pronunciation:	Hellandite-(Ce) + Pronunciation
Synonym:	IMA2000-F