| Britholite-(Ce) | |
| Formula: | (Ce,Ca)(SiO)OH |
| Imasymbol: | Bri-Ce[1] |
| System: | Hexagonal - Dipyramidal |
| Symmetry: | P63/m |
| Colour: | Brown, greenish brown, yellow, resin brown, black |
| Mohs: | 5.5 |
| Luster: | Adamantine - Resinous |
| Gravity: | 4.45 |
| Density: | 4.45 |
| Var1: | hardness |
| Var1text: | 5.5 on the Mohs scale |
| Var3: | type locality |
| Var3text: | Naujakasik(Naajakasik), Tunulliarfik Fjord, Ilímaussaq complex, Narsaq, Kujalleq, Greenland |
Britholite-(Ce) is a rare radioactive mineral with the chemical formula . It comes in a variety of different colors. Its type locality is Naujakasik (Naajakasik), Tunulliarfik Fjord, Ilímaussaq complex, Narsaq, Kujalleq, Greenland.
The mineral was first discovered by Gustaf Flink in 1897 inside a nepheline-syenite at Naujakasik, Ilímaussaq complex, Greenland. It was named after the Greek word Greek, Ancient (to 1453);: βρῖθος (Greek, Ancient (to 1453);: brithos) which means "weight" referring to its high specific gravity, it was later named britholite-(Ce) due to the high amounts of cerium in its composition.[2]