The standard block is a 1″ (25 mm) diameter and 0.2″ (5 mm) thick brass disk with 97 holes. In each hole is a crystalline or glass material, most of which are suitable as primary or secondary X-ray analytical standards. Each has been chemically characterized to one degree or another. In the images below, click on any of the 97 locations, or the margin, for details of each material. In the detailed pages elements are shown for which concentrations are known to be at least 0.01% by weight (the block can also be used with electron probes). Concentrations are in weight percent of the elements, not the oxides. The disk bottom is exposed metal, so the block can either be mounted in a 1 inch (25 mm) rounds mount or it can rest on any flat metal sample holder without need of conductive paint, but don’t let it slip off. The polished, carbon coated surface is extremely fragile, so never touch it even with gloves unless you are planning on repolishing and recoating it.
Cartoon standard block map. Click on each sample to learn more about it. Here is a PDF of both maps. Color codes inside circles are as follows:
Blue: Primary standards: Homogeneous and chemically well-characterized.
Yellow: Secondary standards: Homogeneous but chemically not so well characterized. With more work these can become primary standards.
Pink: Questionable: See comments for each standard; may be inhomogeneous, a mixture of several different phases, or compositionally poorly characterized.
BSE image standard block map. Click on each sample to learn more about it. Here is a PDF of both maps.