Arctite
Ba(Ca7 Na5 )(PO4 )4 (PO4 )2 F3
—
—
Open
White glassy granular crystals of arctite from Vuonnemiok River Valley, Kola, Russian Federation
©
Photograph by David Hospital, CC-BY-SA 3.0
8
0
—
Mineral, Orthophosphate , Phosphate
Arfvedsonite
NaNa2 (FeII 4 FeIII )Si8 O22 (OH)2
Arfvedsonite root name group
—
0
0
—
Mineral, Hydroxide , Silicate
Arfvedsonite root name group
A Na2 (ZII 4 FeIII }Si8 O22 (OH,F,Cl)2
Sodium amphibole
Magnesio-arfvedsonite , Potassic-arfvedsonite , Potassic-magnesio-fluoro-arfvedsonite , Arfvedsonite , Magnesio-fluoro-arfvedsonite , Potassic-magnesio-arfvedsonite
0
0
—
Group , Silicate
Argentite
Ag2 S
Silver sulphide
—
0
0
—
Sulphide
Argon
Ar
—
—
Open
Image of an argon filled discharge tube shaped like the element’s atomic symbol.
©
Photo by Pslawinski (via WIkimedia Commons), CC-BY-SA 2.5
6
0
—
Element
Argutite
GeO2
Rutile (group)
—
0
0
—
Mineral, Simple oxide
Armenite
BaCa2 (Al6 Si9 )O30 ·2H2 O
Osumilite (group)
—
0
0
—
Hydrated , Mineral, Aluminosilicate
Arsenic
As
—
Arsenolamprite
13
0
—
Mineral, Element
Arsenolamprite
As
Arsenic
—
0
0
—
Mineral
Arsenuranylite
Ca(UO2 )4 (AsO4 )2 (OH)4 ·6H2 O
—
—
Open
Arsenuranylite from the TL in Cherkasar Uranium Deposit, Pap, Chatkal-Kuraminskii Range, Namangan Viloyati, Uzbekistan
©
Photo by David Hospital (on wikimedia.org), CC-BY-SA 4.0
3
0
—
Arsenate , Hydrated , Uranyl , Mineral, Hydroxide
Astatine
At
—
—
3
0
—
Element
Augite
(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2 O6
Clinopyroxene
—
Open
Augite, Muhavura volcano, Ruhengeri Region, Northern Province, Rwanda
©
CC BY-SA 4.0, Didier Descouens
4
2
EDS
Mineral, Silicate
Auriacusite
FeIII CuII (AsO4 )O
Olivenite (group)
—
0
0
—
Arsenate , Mineral
Aurostibite
AuSb2
Pyrite (group)
—
0
0
—
Mineral
Autunite
Na(UO2 )(PO4 )·3H2 O, Ca0.73 Sr0.19 (UO2 )2.19 (PO4 )2 ·8.5(H2 O), Ca(UO2 )2 (PO4 )2 ·9.1(H2 O), HUO2 PO4 ·4(H2 O), Ca(UO2 )2 (PO4 )2 ·10-12(H2 O)
Autunite (group)
—
Open
Autunite specimen from Daybreak Mine, Mount Kit Carson, Spokane Co., WA, USA
©
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
18
0
—
Uranyl , Mineral, Hydrated , Phosphate , Orthophosphate