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Britholite-(Ce)
General
Category	Mineral
Formula (repeating unit)	(Ce,Ca)5(SiO4)3OH
Identification
Colour	Brown, greenish brown, yellow, resin brown, black
Luster	Adamantine - Resinous
Density	4.45
Major varieties
Hardness	5.5
Crystal System	Hexagonal

Britholite-(Ce) is a rare mineral with the chemical formula (Ce,Ca)₅(SiO₄)₃OH. it comes in a variety of different colors. it’s type locality is Naujakasik(Naajakasik), Tunulliarfik Fjord, Ilímaussaq complex, Narsaq, Kujalleq and Greenland

external links

• https://www.mindat.org/min-775.html
• http://webmineral.com/data/Britholite-(Ce).shtml#.Xx7jby1jShA