i understand any objects with arrow pointed are no good for feng shui,because the arrow hits the occupants of the house.I bought a big clear crystal quartz  with many small crystaly pointed head  and few big crystal pointed head judging out.so isit bad feng shui to keep or place in the house??when all these pointed head are not facing upward but facing directly straight to the dining hall.please advise

Too many crystal  or large crystal will effect the qi. Therefore, it depends on the lcoation. Pointed head fro them if pointing directly to some one for a long period of time for example your bed is acceptable.

Cheers.