sentences:  Porous limestones may form disseminated ores, however most MVT deposits are massive sulfides with knife-like margins between carbonate and sulfide mineralogies.Ore minerals in carbonate replacement deposits are typically lead sulfide, galena, and zinc sulfide sphalerite.Weathered equivalents form anglesite, cerussite, smithsonite, hydrozincite and secondary galena and sphalerite within the supergene zone.