| Abernathyite | |
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| Adamite | |
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| Adelite | |
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| Aerugite | |
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| Agardite-(Ce) | |
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| 'Agardite-(Dy)' | |
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| Agardite-(La) | |
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| Agardite-(Nd) | |
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| Agardite-(Y) | | (Y,Ca)Cu | | (AsO | | ) | | (AsO | | ,HAsO | | )(OH) | | · 3H | | O |
|
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| Akrochordite | |
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| 'Aktashite' | |
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| Alacránite | |
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| Alarsite | |
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| Algodonite | |
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| Allactite | |
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| Alloclasite | |
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| Ambrinoite | | [K,(NH | | )] | | (As,Sb) | | (Sb,As) | | S | | · H | | O |
|
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| 'Ammonium-Uranospinite' | |
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| Anduoite | |
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| Andyrobertsite | |
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| Angelellite | |
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| Annabergite | |
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| 'Annivite' | |
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| Anorpiment | |
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| 'Antimonial Arsenic' | |
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| 'Antimonian Claudetite' | |
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| 'Antimonian Gersdorffite' | |
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| Arakiite | | (Zn,Mn | | )(Mn | | ,Mg) | | (Fe | | ,Al) | | (As | | O | | ) | | (As | | O | | )(OH) | | |
|
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| Ardennite-(As) | | Mn | | (Al,Mg) | | (Si | | O | | )(SiO | | ) | | (AsO | | ,VO | | )(OH) | | |
|
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| 'Argentoalgodonite' | |
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| 'Argentodomeykite' | |
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| Argentotennantite | |
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| Arhbarite | |
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| 'Arite' | |
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| Armangite | |
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| 'Arsenargentite' | |
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| 'Arsenatian Vanadinite' | |
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| Arsenbrackebuschite | |
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| Arsendescloizite | |
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| 'Arsenian Renierite' | |
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| Arsenic | |
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| 'Arsenic Sulphide Glass No. 1' | |
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| Arseniopleite | |
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| Arseniosiderite | |
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| 'Arsenmiargyrite' | |
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| 'Arsennickeleisen' | |
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| Arsenoclasite | |
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| Arsenocrandallite | |
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| Arsenoflorencite-(Ce) | |
|---|
| Arsenoflorencite-(La) | | (La,Ce,Nd)(Al,Fe | | ) | | (AsO | | ,PO | | ) | | (OH) | | |
|
|---|