Can someone please help me identify these rocks please ](https://i.stack.imgur.com/y28zy.jpg)
This is not a rock but a mineral. A rock is a conglomerate of several crystals, usually of different types of minerals. A crystal is one single systematic structure of atoms.
It would help to see the crystal from more than one perspective, but judging from the pictures available I suggest that is is gypsum.
Wikipedia: Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO. 4· 2H2O.
Plagioclase is also not unlikely.