Arsenic (As) Minerals sorted by Descending Weight Percent
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| % As | Mineral Name | Chemical Formula | MW |
| 100.00 % As | Arsenic # | As | 74.92 |
| 100.00 % As | Arsenolamprite # | As | 74.92 |
| 92.04 % As | Pararsenolamprite ! | As | 76.51 |
| 90.33 % As | Duranusite | As4S | 331.75 |
| 78.13 % As | Ferroskutterudite ! | (Fe,Co)As3 | 276.94 |
| 78.12 % As | Nickelskutterudite # | (Ni,Co)As3-x | 268.53 |
| 76.09 % As | Skutterudite # | (Co,Ni)As3-x | 246.18 |
| 75.74 % As | Claudetite # | As2O3 | 197.84 |
| 75.74 % As | Arsenolite # | As2O3 | 197.84 |
| 75.70 % As | Dimorphite # | As4S3 | 395.88 |
| 72.85 % As | Lollingite # | FeAs2 | 205.69 |
| 72.10 % As | Clinosafflorite | (Co,Fe,Ni)As2 | 207.83 |
| 72.04 % As | Safflorite # | (Co,Fe)As2 | 208.00 |
| 71.86 % As | Rammelsbergite # | NiAs2 | 208.53 |
| 71.86 % As | Krutovite | NiAs2 | 208.53 |
| 71.86 % As | Pararammelsbergite # | NiAs2 | 208.53 |
| 70.22 % As | Paxite | CuAs2 | 213.39 |
| 70.03 % As | Pararealgar | AsS | 106.99 |
| 70.03 % As | Realgar # | AsS | 106.99 |
| 67.50 % As | Alacranite | As8S9 | 887.97 |
| 65.15 % As | Uzonite | As4S5 | 460.02 |
| 60.90 % As | Orpiment # | As2S3 | 246.04 |
| 56.79 % As | Westerveldite | (Fe,Ni,Co)As | 131.93 |
| 56.30 % As | Modderite # | (Co,Fe)As | 133.08 |
| 56.07 % As | Nickeline # | NiAs | 133.61 |
| 56.00 % As | Langisite | (Co,Ni)As | 133.79 |
| 54.85 % As | Anduoite | (Ru,Os)As2 | 273.20 |
| 54.02 % As | Trippkeite # | CuAs+++2O4 | 277.39 |
| 53.86 % As | Karibibite | Fe+++2As+++4(O,OH)9 | 556.38 |
| 53.66 % As | Leiteite | ZnAs+++2O4 | 279.23 |
| 48.91 % As | Ludlockite-(Pb) * | PbFe+++4As+++10O22 | 1,531.79 |
| 48.45 % As | Ludlockite | (Fe++,Pb)As+++++2O6 | 309.25 |
| 48.14 % As | Maucherite # | Ni11As8 | 1,244.96 |
| 47.45 % As | Asbecasite | Ca3(Ti,Sn)As+++6Si2Be2O20 | 1,057.85 |
| 47.16 % As | Omeiite | (Os,Ru)As2 | 317.76 |
| 46.93 % As | Iridarsenite | (Ir,Ru)As2 | 319.28 |
| 46.84 % As | Svenekite ! | Ca(H2AsO4)2 | 319.93 |
| 46.48 % As | Schneiderhohnite | Fe++Fe+++3As+++5O13 | 805.99 |
| 46.40 % As | Wakabayashilite | (As,Sb)6As4S14 | 1,291.80 |
| 46.38 % As | Oregonite | Ni2FeAs2 | 323.07 |
| 46.18 % As | Lazarenkoite | CaFe++As+++3O7·3(H2O) | 486.73 |
| 46.11 % As | Jeromite ? | As(S,Se)2 | 162.50 |
| 46.01 % As | Arsenopyrite # | FeAsS | 162.83 |
| 45.37 % As | Alloclasite # | (Co,Fe)AsS | 165.15 |
| 45.37 % As | Glaucodot # | (Co,Fe)AsS | 165.15 |
| 45.30 % As | Ruthenarsenite | (Ru,Ni)As | 165.40 |
| 45.22 % As | Gersdorffite # | NiAsS | 165.68 |
| 45.16 % As | Alarsite ! | AlAsO4 | 165.90 |
| 45.16 % As | Cobaltite # | CoAsS | 165.92 |
| 43.93 % As | Lautite # | CuAsS | 170.53 |
| 43.44 % As | Sperrylite # | PtAs2 | 344.92 |
| 42.62 % As | Laphamite | As2(Se,S)3 | 351.55 |
| 42.13 % As | Cherepanovite | RhAs | 177.83 |
| 41.62 % As | Weilite | CaHAsO4 | 180.01 |
| 41.39 % As | Haidingerite # | Ca(AsO3OH)·(H2O) | 181.01 |
| 40.90 % As | Nickenichite | Na0,8Ca0,4(Mg,Fe+++,Al)3Cu0,4(AsO4)3 | 549.61 |
| 40.31 % As | Cafarsite | Ca8(Ti,Fe++,Fe+++,Mn)6-7(As+++O3)12·4(H2O) | 2,230.31 |
| 39.03 % As | Radovanite ! | Cu2Fe+++(AsO4)[As+++O2(OH)2]·H2O | 575.94 |
| 38.90 % As | Kaatialaite | Fe+++[H2As+++++O4]3·5-5.5(H2O) | 577.74 |
| 38.64 % As | Petewilliamsite ! | (Ni,Co,Cu)30(As2O7)15 | 5,730.36 |
| 38.22 % As | Berzeliite # | (Ca,Na)3(Mg,Mn)2(AsO4)3 | 588.10 |
| 38.09 % As | Stibarsen # | SbAs | 196.67 |
| 37.68 % As | Mcnearite | NaCa5H4(AsO4)5·4(H2O) | 994.07 |
| 37.16 % As | Yazganite ! | NaFe+++2(Mg,Mn)(AsO4)3·H2O | 602.82 |
| 37.10 % As | Mansfieldite # | AlAsO4·2(H2O) | 201.93 |
| 37.02 % As | Odanielite | Na(Zn,Mg)3H2(AsO4)3 | 607.12 |
| 36.80 % As | Irhtemite | Ca4Mg(AsO3OH)2(AsO4)2·4(H2O) | 814.37 |
| 36.54 % As | Bergslagite | CaBe(AsO4)(OH) | 205.02 |
| 36.47 % As | Fluckite | CaMn(HAsO4)2·2(H2O) | 410.90 |
| 36.40 % As | Armangite # | Mn26As+++18O50(OH)4(CO3) | 3,704.99 |
| 36.36 % As | Johillerite | Na(Mg,Zn)3Cu(AsO4)3 | 610.00 |
| 36.33 % As | Manganberzeliite # | (Ca,Na)3(Mn,Mg)2(AsO4)3 | 618.74 |
| 36.22 % As | Cabalzarite ! | Ca(Mg,Al,Fe++)2(AsO4)2(H2O,OH)2 | 413.71 |
| 36.12 % As | Manganlotharmeyerite ! | Ca(Mn+++,Mg,)2(AsO4)2(OH,H2O)2 | 414.80 |
| 36.10 % As | Sainfeldite | Ca5(AsO3OH)2(AsO4)2·4(H2O) | 830.14 |
| 36.04 % As | Durangite # | NaAl(AsO4)F | 207.89 |
| 36.01 % As | Ruarsite | RuAsS | 208.06 |
| 35.82 % As | Talmessite | Ca2Mg(AsO4)2·2(H2O) | 418.33 |
| 35.44 % As | Johnbaumite | Ca5(AsO4)3(OH) | 634.15 |
| 35.33 % As | Vladimirite # | Ca5(AsO3OH)2(AsO4)2·5(H2O) | 848.16 |
| 35.33 % As | Svabite # | Ca5(AsO4)3F | 636.15 |
| 35.24 % As | Jolliffeite | (Ni,Co)AsSe | 212.63 |
| 35.09 % As | Wendwilsonite | Ca2(Mg,Co)(AsO4)2·2(H2O) | 426.99 |
| 35.09 % As | Fetiasite | (Fe++,Fe+++,Ti++++)3O2(As+++2O5) | 426.99 |
| 34.86 % As | Orcelite | Ni5-xAs2 (x=0.23) | 429.79 |
| 34.85 % As | Hutchinsonite # | (Pb,Tl)2As5S9 | 1,074.79 |
| 34.68 % As | Pharmacolite # | CaHAsO4·2(H2O) | 216.04 |
| 34.49 % As | Grischunite | NaCa2Mn++5Fe+++(AsO4)6·2(H2O) | 1,303.23 |
| 34.49 % As | Novakite | (Cu,Ag)21As10 | 2,172.33 |
| 34.29 % As | Cobaltkoritnigite | (Co,Zn)(AsO3OH)·(H2O) | 218.49 |
| 34.01 % As | Adelite # | CaMg(AsO4)(OH) | 220.31 |
| 33.98 % As | Menshikovite ! | Pd3Ni2As3 | 661.40 |
| 33.95 % As | Brandtite # | Ca2(Mn,Mg)(AsO4)2·2(H2O) | 441.30 |
| 33.90 % As | Reinerite | Zn3(As+++O3)2 | 442.01 |
| 33.89 % As | Stibioclaudetite ! | AsSbO3 | 240.55 |
| 33.83 % As | Geminite | Cu++2As+++++2O7·3(H2O) | 442.98 |
| 33.80 % As | Magnussonite # | Mn++5As+++3O9(OH,Cl) | 665.07 |
| 33.74 % As | Borishanskiite | Pd1+x(As,Pb)2, x = 0-0.2 | 333.04 |
| 33.73 % As | Roselite # | Ca2(Co,Mg)(AsO4)2·2(H2O) | 444.30 |
| 33.73 % As | Roselite-beta # | Ca2(Co,Mg)(AsO4)2·2(H2O) | 444.30 |
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( Bold - Valid Mineral Name)
(* - Mineral Name is Not IMA Approved)
(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name)
(# - Grandfathered as valid)