I found these 2 at the beach on the east coast of the North Island in New Zealand.
The white one is beautiful, it sparkles and glimmers and even the brown/pink veins through it sparkle, but it's quite fragile; I can break some off with my fingernail. It reflects the light quite bright as well.
The dark one is very hard, looks yellow/brown when held up to the sun and has thick white lines through some of it. Found a couple of these. I thought it was smoky quartz but have been told it's not. It doesn't reflect the light it seems to take it in.