Acanthite Ag2 S
Silver sulphide , Acanthite (group) —
Open
Acanthite specimen from Arizpe, Sonora, Mexico
Photo by Ken Larsen, via Smithsonian National Museum of Natural History
3
1
SXES
Mineral, Sulphide
Actinolite ☐Ca2 (Mg4.5-2.5 FeII 0.5-2.5 )Si8 O22 (OH)2
Ferro-actinolite-Tremolite (series) , Actinolite root name group , Minerals containing OH —
Open
Actinolite specimen from White River, Wenatchee National Forest, WA, USA
Photo by Penland, via Smithsonian National Museum of Natural History
2
2
Reflectance
Mineral, Silicate , Hydroxide
Adamite Zn2 (AsO4 )(OH)
Minerals containing OH , Olivenite (group) , Minerals containing AsO4 —
Open
Adamite on limonite, from Mina Ojuela, Mapimi, Durango, Mexico. Size: 6.6 x 4.8 x 4.2 cm
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
5
0
PL
Hydroxide , Mineral, Arsenate
Adularia KAlSi3 O8
K feldspar —
Open
Adularia specimen from San Gottardo, Ticino, Switzerland
Photo by Smithsonian Photographic Services
27
3
CL/SEM, SXES
Aluminosilicate , Variety
Afghanite (Na,K)22 Ca10 (Si24 Al24 )O96 (SO4 )6 Cl6
Minerals containing SO4 , Calcrinite (group) —
13
0
PL
Mineral, Sulphate , Halide , Aluminosilicate
Afwillite Ca3 [SiO3 (OH)]2 ·2H2 O
Minerals containing OH , Minerals containing H2O —
Open
1.03 mm group of Afwillite crystals. Collection Domenico Preite photo Matteo Chinellato. From Campomorto Quarry, Pietra Massa Locality, Montalto di Castro, Viterbo Province, Latium, Italy
(C) 2010 Matteo Chinellato (via Wikimedia Commons). CC-BY-SA-3.0
7
0
IR
Hydroxide , Mineral, Silicate , Hydrated
Agate SiO2
Quartz, microcrystalline Youngite
Open
Condor agate from the mountain range near San Rafael City, in Mendoza Province, Argentina.
Photo by Luis de los Santos (via Wikimedia Commons), CC-BY-SA 3.0
3
6
CL
Variety, Simple oxide
Agrellite NaCa2 Si4 O10 F
—
—
Open
Fluorescent agrellite, Museo di Storia Naturale (Florence)
Photograph by Sailko (via Wikimedia Commons), CC-BY-SA 3.0
15
0
PL, PL/XL
Mineral, Silicate
Albite (Na,Ca)(Si,Al)4 O8 , NaAlSi3 O8
Plagioclase , Alkali feldspar —
Open
Albite specimen from Crete, Greece. Scale at bottom of image is one inch with a rule at one cm.
Photo by Rock Currier (via Wikimedia Commons), CC-BY 3.0
78
12
CL, CL/SEM, EDS, Reflectance, SXES
Mineral, Aluminosilicate
Alforsite Ba5 (PO4 )3 Cl
Apatite (group) , Minerals containing PO4 —
1
0
Unknown
Mineral, Phosphate , Orthophosphate
Alkali feldspar (Na,K)AlSi3 O8
Feldspar (group) Sanidine, high , Rubicline , Ferrisanidine , K feldspar , Anorthoclase , Sanidine , Albite , Kokchetavite
Open
Specimen of anorthoclase, from Mount Franklin, 9 km north of Daylesford, Victoria, Australia. Specimen M 24369.1, Museums Victoria
Photo by William D Birch, Copyright Museums Victoria / CC BY (Licensed as Attribution 4.0 International)
14
1
CL
Aluminosilicate , Subgroup
Allophane Al2 O3 (SiO2 )1.3-2.0 ·2.5-3.0H2 O
Minerals containing H2O —
Open
Allophane from Kelly Mine, Magdalena District, Socorro County, New Mexico, USA
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
9
0
PL
Mineral, Hydrated , Aluminosilicate
Almandine FeII 3 Al2 (SiO4 )3
Garnet , Minerals containing SiO4 —
Open
Garnet specimen from Idaho, USA
Photo by Chip Clark, via Smithsonian National Museum of Natural History
0
1
Reflectance
Mineral, Aluminosilicate
Alstonite BaCa(CO3 )2
Minerals containing CO3 —
Open
Specimen of alstonite from Brownley Hill Mine, Nenthead, Alston Moor District, North Pennines, Cumbria, England, UK
Photo by Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
1
0
PL
Carbonate , Mineral
Alumina Al2 O3
—
Corundum
Open
Photograph of aluminium oxide
Photo by Ondřej Mangl, Public Domain
25
1
CL/SEM
Simple oxide , Synthetic , Compound
