THE FRANCON QUARRY IS A VERY LARGE LIMESTONE QUARRY IN THE 'MIDDLE' OF A VERY LARGE CITY, MONTREAL. CLOSED FOR MANY YEARS NOW IT SERVES MAINLY AS A SNOW DUMP IN WINTER. THERE IS A SILL ABOUT TWO-THIRDS THE WAY UP THE WALL CONTAINING MANY RARE MINERALS.( MINDAT SAYS 78 MINERALS TOTAL/10 TYPE MINERALS). THIS SILL IS AN INTRUSION FROM MOUNT ROYAL, A MONTEREGIAN HILL, AND THEREFORE THERE ARE SOME SIMILITUDES WITH CLOSEBY MONT-ST-HILAIRE. MOST FAMOUS HERE IS WELOGANITE, WHICH POSSESSES THE VERY RARE PROPERTY OF TRIBOLINESCENCE, THAT IS THAT IT EMITS LIGHT WHEN CRUSHED. IT IS A FAINT BLUE AND SHORT LIVED. WELOGANITE IS YELLOW AND CRYSTALIZES IN A VERY UNIQUE FORM. DAWSONITE IS ALSO VERY BEAUTIFUL AND RARE, IN PARTICULAR WHEN ACICULAR CRYSTALS BRILLIANTLY SHINE IN THE SUN.