The Times Concise puzzle clues 2017 Jun 28

• Constituent of sandstone and quartz Crossword Clue
• Exchanging Crossword Clue
• Large-scale choral work Crossword Clue
• Mocking; sceptical Crossword Clue
• More rapid Crossword Clue
• Nigerian city and port Crossword Clue
• Occasion for applause Crossword Clue
• Official proclamation Crossword Clue
• Province of Canada Crossword Clue
• Puzzle for assembling Crossword Clue
• Region characterised by its general weather Crossword Clue
• Scotland's patron saint Crossword Clue
• Spot, splash, smear Crossword Clue