Prince Georges Co., Maryland, USA

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List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmBnXp, with (m+n):p = 1:2
Pyrite	2.12.1.1	FeS2
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
A3(XO4)2·xH2O
Vivianite	40.3.6.1	Fe2+3(PO4)2 · 8H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)5(XO4)3Zq
Rockbridgeite	41.9.2.1	Fe2+Fe3+4(PO4)3(OH)5
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz	75.1.3.1	SiO2
Unclassified Minerals
'Clay'	-
'Fairbanksite'	-
'Limonite'	-	FeO(OH) · nH2O
'Ochre'	-
Opal var: Opal-AN	-	SiO2 · nH2O
'Petrified Wood'	-

10 entries listed. 5 valid minerals.