What hardness dos a mineral have if it does not scratch glass but it scratches an iron nail?

A mineral that cannot scratch glass but can scratch an iron nail has a hardness between 5.5 and 6.5 on the Mohs hardness scale. Glass typically has a hardness of around 5.5, while iron nails generally have a hardness of about 4.5. Therefore, the mineral's hardness falls within this range, indicating it is harder than the nail but softer than glass.