Did your pouch have 7 crystals in it? And do you know what the other six are?, normally with chakra crystal kits the crystal in your original pic I would think it would be blue lace agate and is for the throat chakra, I don't know how good your colour has shown up on screen. But I would think is blue lace agate and is for the throat chakra, and is very similar to my blue lace agate in shape.
The crystals I have in my Chakra kit, is amethyst, sodalite, blue lace agate, jade, citrine, carnelian and red Jasper.
There are alot of variations of which crystal you can use but I've never really known white agate to be used in a Chakra kit before.