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Aegirine : NaFe3+[Si2O6], Titanite : CaTi[O|SiO4] | |
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Granite Mountain area, Little Rock, Pulaski Co., Arkansas, USA 2mm spray of aegirine on titanite. JBS collection and photo. |
| © JBS 2006 | Photo ID: 79268 View Count: 317 |
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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Granite Mountain Quarry #1, Granite Mountain Area, Little Rock, Pulaski Co., Arkansas, USA 14 mm orange crystal. P. Cristofono specimen and photo. Field collected by Ed Hakesley. |
| © 2008 Peter Cristofono | Photo ID: 191678 View Count: 61 |
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: 74 |
Ankerite : Ca(Fe2+ ,Mg,Mn2+)(CO3)2, Quartz : SiO2 | |
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Jeffrey Quarry, Jeffrey, Pulaski Co., Arkansas, USA 4.1 x 2.8 x 2.1 cm. A KILLER, brown ankerite crystal disc aesthetically attached to a gorgeous, jackstraw cluster of water-clear, doubly terminated, solution quartz crystals from a small, NEW FIND at the Jeffrey Quarry, near Little Rock, Arkansas. This is a SUPERB, essentially pristine combo and the ankerite crystal is LARGE for the locality and ... |
| © Rob Lavinsky | Photo ID: 171698 View Count: 103 |
Ankerite : Ca(Fe2+ ,Mg,Mn2+)(CO3)2, Quartz : SiO2 | |
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Jeffrey Quarry, Jeffrey, Pulaski Co., Arkansas, USA 3.9 x 3.2 x 1.4 cm. A fine, 2.4 cm, translucent, tan ankerite crystal disc attached to a fine, L-shaped cluster of water-clear, doubly terminated solution quartz crystals from a rare find at the Jeffrey Quarry, near Little Rock, Arkansas. Ex. George Feist collection. |
| © Rob Lavinsky | Photo ID: 178894 View Count: 67 |
Ankerite : Ca(Fe2+ ,Mg,Mn2+)(CO3)2, Quartz : SiO2 | |
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Jeffrey Quarry, Jeffrey, Pulaski Co., Arkansas, USA Two inter-connected disc shaped rhombohedral crystals of rusty brown ankerite are forming an aesthetic cluster without matrix. Complete all around and a floater. Minor quartz in association. Size: 2.4 x 1.6 x 1.2 cm. |
| © Dan Weinrich, Inc. | Photo ID: 224890 View Count: 35 |
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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