You've probably already google-fu'ed this, but its ~4mm crushed granite used as a concrete-sand substitute where granite/gneiss sand isn't available. Most cons

You've probably already google-fu'ed this, but its ~4mm crushed granite used as a concrete-sand substitute where granite/gneiss sand isn't available. Most construction materials businesses sell locally by word of mouth, and if they paid for a website at all it's old and still using http. So Google drops them.