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		 57 answers 
	    	 
	    	
			| Name | Formula | Density |  
						| JACOBSITE | (Mn+2,Fe+2,Mg) (Fe+3,Mn+3)2 O4 | 4.76 |  
						| JADEITE | Na (Al,Fe+3) Si2 O6 | 3.25 |  
						| JAFFEITE | Ca5 Si2 O7 (OH)6 | 2.65 |  
						| JAGOITE | Pb3 Fe+3 Si4 O12 (Cl,OH) | 5.43 |  
						| JAGOWERITE | Ba Al2 (PO4)2 (OH)2 | 4.01 |  
						| JAHNSITE-CAMNFE | Ca Mn+2 Fe2 +2 Fe2 +3 (PO4)4 (OH)2 8H2 O | 2.86 |  
						| JAHNSITE-CAMNMG | Ca Mn (Mg,Fe+2)2 Fe2 +2 (PO4)4 (OH)2 8H2 O | 2.71 |  
						| JAHNSITE-CAMNMN | Ca Mn+2 Mn2 +2 Fe2 +3 (PO4)4 (OH)2 8H2 O | 2.78 |  
						| JAIPURITE | gamma Co S | 5.45 |  
						| JALPAITE | Ag3 Cu S2 | 6.82 |  
						| JAMBORITE | (Ni+2,Ni+3,Fe) (OH)2 (OH,S,H2 O) (?) | 2.67 |  
						| JAMESITE | Pb2 Zn2 Fe5 +3 (AsO4)5 O4 | 5.1 |  
						| JAMESONITE | Pb4 Fe Sb6 S14 | 5.63 |  
						| JANGGUNITE | Mn5-x +4 (Mn+2,Fe+3)1+x O8 (OH)6 (x=0.2) | 3.59 |  
						| JANHAUGITE | Na3 Mn3 +2 Ti2 Si4 O15 (OH,F,O)3 | 3.6 |  
						| JARLITE | Na Sr3 Al3 (F,OH)16 | 3.87 |  
						| JAROSEWICHITE | Mn3 +2 Mn+3 (AsO4)(OH)6 | 3.66 |  
						| JAROSITE | K Fe3 +3 (SO4)2 (OH)6 | 3.08 |  
						| JASKOLSKIITE | Pb2+x Cux (Sb,Bi)2-x S5 (x=0,2) | 6.5 |  
						| JASMUNDITE | Ca11 (SiO4)4 O2 S | 3.03 |  
						| JEANBANDYITE | (Fe+3,Mn+2)Sn+4 (OH)6 | 4.41 |  
						| JEFFREYITE | (Ca,Na)2 (Be,Al) Si2 (O,OH)7 | 2.99 |  
						| JENNITE | Ca9 H2 Si6 O18 (OH)8 6H2 O | 2.32 |  
						| JEPPEITE | (K,Ba)2 (Ti,Fe+3)6 O13 | 3.94 |  
						| JEREMEJEVITE | Al6 B5 O15 (F,OH)3 | 3.3 |  
						| JERRYGIBBSITE | Mn9 +2 (SiO4)4 (OH)2 | 4 |  
						| JERVISITE | (Na,Ca,Fe+2) (Sc,Mg,Fe+2) Si2 O6 | 3.22 |  
						| JIANSHUIITE | (Mg,Mn+2) Mn3 +4 O7 3H2 O | 3.6 |  
						| JIMBOITE | Mn3 +2 B2 O6 | 3.98 |  
						| JIMTHOMPSONITE | (Mg,Fe+2)5 Si6 O16 (OH)2 | 3.03 |  
						| JINSHAJIANGITE | (Ba,Ca)4 (Na,Ca)5 (Fe+2,Mn+2)15 (Ti,Fe+3,Nb,Zr)8 Si15 O64 (F,OH)6 | 3.61 |  
						| JIXIANITE | Pb (W,Fe+3)2 (O,OH)7 | 6.04 |  
						| JOAQUINITE-CE | Ba2 Na Ce2 Fe+2 (Ti,Nb)2 Si8 O26 (OH,F)2 H2O | 3.98 |  
						| JOESMITHITE | Pb Ca2 (Mg,Fe+2,Fe+3)5 Si6 Be2 O22 (OH)2 | 3.83 |  
						| JOHACHIDOLITE | Ca Al B3 O7 | 3.37 |  
						| JOHANNITE | Cu (UO2)2 (SO4)2 (OH)2 8H2 O | 3.32 |  
						| JOHANNSENITE | Ca Mn+2 Si2 O6 | 3.5 |  
						| JOHILLERITE | Na (Mg,Zn)3 Cu+2 (AsO4)3 | 4.15 |  
						| JOHNBAUMITE | Ca5 (AsO4)3 (OH) | 3.68 |  
						| JOHNINNESITE | Na2 Mg4 Mn12 +2 As2 +5 Si12 O43 (OH)6 | 3.48 |  
						| JOHNSOMERVILLEITE | Na2 Ca (Mg,Fe+2,Mn)7 (PO4)6 | 3.35 |  
						| JOHNWALKITE | K (Mn+2,Fe+3,Fe+2)2 (Nb,Ta) (PO4)2 O2 (H2 O,OH)2 | 3.4 |  
						| JOKOKUITE | Mn+2 SO4 5H2 O | 2.03 |  
						| JOLIOTITE | (UO2) (CO3) nH2 O (n=2 ?) | 4.04 |  
						| JOLLIFFEITE | Ni As Se | 7.12 |  
						| JONESITE | Ba4 (K,Na)2 Ti4 Al2 Si10 O36 6H2 O | 3.25 |  
						| JORDANITE | Pb14 (As,Sb)6 S23 | 6.44 |  
						| JOSEITE-A | B4 (S,Te)3 | 8.18 |  
						| JOSEITE-B | Bi4 (Te,S)3 | 8.3 |  
						| JOURAVSKITE | Ca6 Mn2 +4 (SO4,CO3)4 (OH)12 26H2 O | 1.95 |  
						| JUANITE | Ca10 Mg4 Al2 Si11 O39 4H2 O (?) | 3.28 |  
						| JULGOLDITE-FE | (Ca,K)2 Fe+3 Fe+3 Si3 (O,OH)14 | 3.53 |  
						| JULIENITE | Na2 Co (SCN)4 8H2 O | 1.65 |  
						| JUNGITE | Ca2 Zn4 Fe8 +3 (PO4)9 16H2 O | 2.84 |  
						| JUNITOITE | Ca Zn2 Si2 O7 H2 O | 3.5 |  
						| JUNOITE | Pb3 Cu2 Bi8 (S,Se)16 | 6.77 |  
						| JURBANITE | Al (SO4)(OH) 5H2 O | 1.79 |  |