What is referred to by 'a rock'?

Based on the clue 'a rock called pridotite produces this hardest gem', what is the answer? Based on the clue 'a rock climber would know schist a person in this ...', what is the answer? Based on the clue 'a rock group how deep is your love', what is the answer? Based on the clue 'a rock variety of game hen is named for this south...', what is the answer? Based on the clue 'a rocket launched at the equator needs less fuel ...', what is the answer? Based on the clue 'a rocket lifting off is an example of the third la...', what is the answer? Based on the clue 'a rocket scientist in training you interned at thi...', what is the answer? Based on the clue 'a rockets thrust may be measured in units named fo...', what is the answer?