| 1. | It forms colourless, dimorphous crystals at room temperature and is only slightly soluble in water.
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| 2. | "' Stolzite "'is a mineral, a lead tungstate; with the dimorphous with the monoclinic form raspite.
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| 3. | "' Hawleyite "'is a rare sulfide mineral in the sphalerite group, dimorphous and easily confused with greenockite.
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| 4. | "' Langite "'is a rare hydrated copper sulfate mineral, with hydroxyl, found almost exclusively in dimorphous with wroewolfeite.
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| 5. | It is the calcium analogue of aldridgeite and it is dimorphous with orthoserpierite CaCu 4 ( SO 4 ) 2 ( OH ) 6 ?H 2 O.
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