Definitions
from The Century Dictionary.
- noun   [capitalized] One of the Order of the Hospitalers of St. John of Jerusalem. See hospitaler .
- noun A mineral of an emerald-green or apple-green color, a hydrous sulphate of the protoxid of uranium.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy  A rare green uranium sulfate mineral .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
After Archduke John of Austria (1782-1859), the founder of the Landesmuseum Joanneum in Styria, Austria. -ite
			
		
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Examples
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								It is also found as sulphate in uranochre, johannite, &c. A Text-book of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer 1886 
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