This product comes in powder form & it is a mixture of alpha and beta forms. We do not have this product available with us, which comes in crystal form.
Regarding the structure of all other products purchased, We kindly ask you to navigate to the link https://www.sigmaaldrich.com/techservice, click on "Product Technical Inquires" under the Products Section with all the required information so that a member of our team can reach out to you to assist further. Thank you.