Fluorapatite

Light green/blue fluorapatite crystal, with excellent form and a double termination. Very nice!

This area of the Grenville is known for its abundance of pegmatites. During the Grenvillian orogeny these rocks had undergone intense deformation and intense metamorphism where calcitic marbles now dominate the lithology. Metasomatic reaction zones developed at the contacts of calcitic marbles and silicate rocks, developing higher than usual quantities of fluorapatite. Blue apatite or green is generally associated with calcite and the crystals are disseminated in clusters.*

*Géologie de la région du lac Sainte-Marie - Comté de Gatineau Cette étude s'est effectuée en coopération avec l'INRS-Géoressources. By Louise Langlais

Read the full report on the Lac Sainte-Marie area here (you may need to use google translate):  https://gq.mines.gouv.qc.ca/documents/examine/MB9351/MB9351.pdf