I found all four in my backyard today while working in the rocks. The first three are more white/gray but not clear at all. The first one is coming out of a blackish colored rock. The last one (on the right), is a strange color and I'm not really sure what it is but it looks neat. If they are not quartz, especially the last one, could someone help identify what they are? Side note: the ruler included is measuring in inches. Thank you.