Possible Clues:

• I see in the sail if it's in a glass
• Quartz, e.g.
• Aunt leaves Saint Lucia with something to fill glass?
• Sounds foolish to crush Manx cat in compound
• Is back, as there's a fair amount of lichen on a rock formation
• Still since regularly excavating atomic mineral
• Quartz that’s still pit-coal, oddly
• ___ gel (drying agent that comes in small packets)
• A bishop about to leave RC church? This matter is insoluble
• Quartz, e.g