Monazite-(Ce) Crystal — Ankazobe, Analamanga, Madagascar

Monazite-(Ce), single crystal. Ankazobe District, Analamanga Region, Madagascar. A well-formed single crystal of monazite-(Ce) from the classic Ankazobe pegmatite district of central Madagascar's Analamanga Region. Monazite is a rare earth phosphate mineral — its dominant species, the cerium-bearing variety, is one of the most important ore minerals for the rare earth elements globally and a significant natural source of both thorium and uranium. This crystal displays the characteristic monoclinic habit: wedge-shaped, with the oblique terminations and striated prism faces that make monazite immediately recognizable on a hand specimen tray. Colour is a rich honey-to-reddish-brown, typical of the Madagascar material, with a resinous lustre on fresh surfaces. Monazite is a geologically significant mineral for several reasons beyond aesthetics. Its exceptional chemical durability and high closure temperature for lead diffusion make it the preferred geochronological mineral for U-Th-Pb dating of Precambrian metamorphic events — many of the ages anchoring our understanding of Gondwana assembly have come from precisely this kind of material. Madagascar's Analamanga pegmatites formed during the Pan-African orogeny (c. 500–550 Ma), a continent-scale collision event that sutured East and West Gondwana, and monazite from this district has contributed to the global geochronological record. Monazite is naturally radioactive due to its thorium and, to a lesser extent, uranium content. This specimen emits low levels of ionizing radiation and is legal to own in Canada and most jurisdictions. Locality: Ankazobe District, Analamanga Region, Madagascar. Approx. specimen size: 20mm x 15mm x 10mm Approx. specimen weight: 5.0 grams Approx. specimen activity on an SE International Ranger EXP: 1500 CPM