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Allanite-(Ce) : {CaCe}{Al2Fe2+}[O|OH|SiO4|Si2O7] | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Brown sprays af Allanite-Ce. Picture width 1,5 mm. Collection and photo Stephan Wolfsried |
| © Stephan Wolfsried | Photo ID: 248593 View Count: 26 |
Analcime : Na2[Al2Si4O12] · 2H2O | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Solitary analcime crystal. Image is about 3 mm in length. Photo and specimen: Steve Stuart. |
| © SMS 2009 | Photo ID: 255672 View Count: 11 |
Anatase : TiO2, Zinnwaldite : KLiFe2+Al[(F,OH)2|AlSi3O10] | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Anatase crystals to about 0.5 mm with tiny spheres of zinnwaldite. P. Cristofono specimen and photo. |
| © 2008 Peter Cristofono | Photo ID: 194185 View Count: 75 |
Apatite-(CaF) : Ca5[F|(PO4)3] | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Picture width 1 mm. Collection and photo Stephan Wolfsried |
| © Stephan Wolfsried | Photo ID: 248609 View Count: 14 |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Slim hexagonal prism of apatite-(CaF) growing out of brown titanite. Image is about 3 mm in length. Photo and specimen: Steve Stuart. |
| © SMS 2009 | Photo ID: 255772 View Count: 7 |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Picture width 1,5 mm. Collection and photo Stephan Wolfsried |
| © Stephan Wolfsried | Photo ID: 248594 View Count: 22 |
Biotite, Titanite : CaTi[O|SiO4], Chlorite Group | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Biotite and titanite with minor green chlorite group. Photo is about 8.6 mm in length. Photo and specimen: Steve Stuart. This specimen is from material I obtained at the Cleveland Micromount Symposium in November 2007. It is from a "gas pocket" at the quarry. |
| © SMS 2007 | Photo ID: 133662 View Count: 114 |
Chalcedony, Siderite : FeCO3 | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Blue chalcedony (coating on a quartz crystal) and brownish siderite crystals. Field of view is about 5 mm across. P. Cristofono specimen and photo. |
| © 2007 Peter Cristofono | Photo ID: 134352 View Count: 142 |
Eggletonite : (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7·11H2O | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Prismatic, brown crystals of Eggletonite from the type locality at Little Rock, Arkansas, USA. Field of view: 4 mm. Specimen and photo: Knut Eldjarn. |
| © Knut Eldjarn | Photo ID: 52956 View Count: 450 |
Eggletonite : (Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7·11H2O, Aegirine : NaFe3+[Si2O6], Albite : Na[AlSi3O8] | |
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Big Rock Quarry (3M quarry), Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA Brown, prismatic crystals from the type locality at Little Rock, Arkansas, USA. Field of view: 4 mm. Specimen and photo: Knut Eldjarn. |
| © Knut Eldjarn | Photo ID: 52955 View Count: 246 |
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