Related Clues:

• A strong leader and hearty too, perhaps, with many layers.
• Approximately 5.5 million tons of it was used to build [see circled letters]
• Son, fast mover, finding allotment
• Yellowish green colour under tip of such rock
• Turn 'mine' into 'ours'
• Open up, in a way
• Rock commonly used in asphalt
• Play group reminder
• Give half away, for example
• Piece of a company
• Rock a prince found in the Kent area
• Rock formed from compressed mud
• Fruit character found under second rock
• Quiet beer possibly source of gas
• Colour's quality can be seen in this architectural material