Which mineral has six sided transparent crystals that will scratch glass?

How much should a coriander plant be watered? Are there links between carbon dioxide and temperature in the ice age? 3 feet of water over one acre of land equals how many gallons? What are animals and plants best protected in? What happens if your water rocket leaks? Is it true or false According to natural selection inherited adaptations that aid an organisms chances of survival will be passed on to offspring? What are the two life-sustaining by-products of photosynthesis? When an individual consumes? Need a rocky name for college reunion related to chemistry? What does calcium and pho and pho us do for your bones? How burning can be harmful? What is global warming and how does it affect weather temperature and ocean water levels? What are measuring devices with lasers used for with earthquakes? Where can you get parts for powerland snowblower? What is the classification of sand and iron fillings? What is A substance made by one cell but used by another? What is non man made? What characteristic of light energy causes people to see objects absorption refraction or reflection? If two objects at rest and at the same height begin to fall a short time after one another and the first object is always going faster does their separation increase decrease or stay the same? What r d different types of chlorophyll present in plants?