| Locality type: | Peak |
| Classification |
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| Species: | Quartz var: Chalcedony |
| Formula: | SiO2 |
| Comments: | Pseudomorphs and coatings after twinned pseudohexagonal aragonite and pseudomorphs after scalenohedral calcite. |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Aragonite | 7 |
| Data |
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| Mineral Data: | Click here to view Chalcedony data |
| Locality Data: | Click here to view Needle Peak (Sierra Aguja), Brewster County, Texas, USA |
| Photo Gallery | View Gallery (14 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 197915 |
| Long-form Identifier: | 1:3:197915:2 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Chalcedony |
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| 10.7km (6.6 miles) | ⓘLittle 38 Mine, Brewster County, Texas, USA |
| 21.3km (13.2 miles) | ⓘFresno mine (Buena Suerte), Presidio County, Texas, USA |
| 26.7km (16.6 miles) | ⓘUnnamed prospect (EM-PR-U24-6), Solitario, Brewster County, Texas, USA |
| 30.8km (19.2 miles) | ⓘChristmas Mountain deposit (Piedra Azul), Christmas Mountains, Brewster County, Texas, USA |
| 33.5km (20.8 miles) | ⓘAgua Fria Ranch, Brewster County, Texas, USA |
| 69.7km (43.3 miles) | ⓘUnnamed prospects near Girvin Tank (PR-PR-T21-1), Presidio County, Texas, USA |
| 95.0km (59.0 miles) | ⓘUnnamed manganese occurrence, Roberts Ranch, Marathon, Brewster County, Texas, USA |
| References |
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Needle Peak, Brewster County, Texas, USA