Piedmont Minerals Company Mine, Hillsborough, Orange Co., North Carolina, USA

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List of minerals arranged by Dana 8th Edition classification

Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Strengite	40.4.1.2	FePO4 · 2H2O
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)3(XO4)2Zq
Lazulite	41.10.1.1	(Mg,Fe2+)Al2(PO4)2(OH)2
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A3(XO4)2Zq·xH2O
Wavellite	42.10.2.1	Al3(PO4)2(OH,F)3 · 5H2O
Miscellaneous
Cacoxenite	42.13.5.1	Fe3+24Al(PO4)17O6(OH)12 · 17H2O
Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [4] and >[4] coordination
Andalusite	52.2.2b.1	Al2(SiO4)O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
Topaz	52.3.1.1	Al2(SiO4)(F,OH)2
Group 57 - SOROSILICATES Si3O10 Groups and Larger Noncyclic Groups
Insular Si3O10 and Larger Noncyclic Groups with [Si5O16] groups
Zunyite	57.3.1.1	Al13Si5O20(OH,F)18Cl
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Pyrophyllite	71.2.1.1	Al2(Si4O10)(OH)2

8 entries listed. 8 valid minerals.