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)
Olivenite (group) , Minerals containing AsO4 , Minerals containing OH —
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 H2O , Minerals containing OH —
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
77
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) Anorthoclase , Sanidine , Sanidine, high , Kokchetavite , Ferrisanidine , Albite , Rubicline , K feldspar
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
Minerals containing SiO4 , Garnet —
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
