Different Formats for Different Numeric Values (Format Function) A user-defined format expression for numbers can have from one to four sections separated by semicolons. If the format argument contains one of the named numeric formats, only one section is allowed.
Because streak is a more accurate illustration of the mineralâs color, streak is a more reliable property of minerals than color for identification. Hardness is one of the better properties of minerals to use for identifying a mineral. Hardness is a measure of the mineralâs resistance to scratching.
If a reference mineral both scratches and can be scratched by a certain test specimen, then the specimen is assumed to possess a hardness equal to that of the reference mineral in question. The set of reference minerals of the Mohs' scale can be supplemented by a few common household items.