Some rocks I have lying around...

[YumaMarc]

These are from mines in Copán, Honduras. The first ones appear to be just quartz, but the last one, the orange one, is new to me. I thought at first it was mica because it is flaky and sparkles, but looking at it real close, I don't know.

Any thoughts?

 

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[DDancer]

Try a hardness test on the three white ones, they appear to be quartz but look like calcite as well. Your last one is quartz, what I call sugar quartz, a mass of small fine quartz crystal all compacted together. I see clear, smokey and citrine quartz all mixed together. The sparkles are facets of individual crystal facets and boundries between crystals.