| Locality type: | Open-Cast Mine |
| Classification |
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| Species: | Montgomeryite |
| Formula: | Ca4MgAl4(PO4)6(OH)4 · 12H2O |
| Quality for species: | Excellent - world class for species or very significant. (!!) |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Whitlockite | 50 |
| Roscherite | 40 |
| Tiptopite | 38 |
| Englishite | 33 |
| Robertsite | 29 |
| Mitridatite | 17 |
| Fairfieldite | 15 |
| Beryl | 12 |
| Microcline | 10 |
| Hurlbutite | 7 |
| Whiteite-(CaMnMg) | 5 |
| Fransoletite | 4 |
| Todorokite | 4 |
| Albite | 3 |
| Dufrénite | 2 |
| Jahnsite Group | 1 |
| Kingsmountite | 1 |
| Messelite | 1 |
| Fluorapatite | 1 |
| Parafransoletite | 1 |
| Jahnsite-(CaMnFe) | 1 |
| Data |
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| Mineral Data: | Click here to view Montgomeryite data |
| Locality Data: | Click here to view Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA |
| Photo Gallery | View Gallery (87 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 43512 |
| Long-form Identifier: | 1:3:43512:7 |
| GUID (UUID V4): | 0 |
| Nearest other occurrences of Montgomeryite |
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| 9.6km (6.0 miles) | ⓘWhite Elephant Mine, Cicero Peak, Pringle, Custer Mining District, Custer County, South Dakota, USA |
| 27.2km (16.9 miles) | ⓘEtta Mine, Keystone, Keystone Mining District, Pennington County, South Dakota, USA |
| 71.6km (44.5 miles) | ⓘWharf Mine, Bald Mountain Mining District (Portland Mining District), Lawrence County, South Dakota, USA |
| References |
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Tip Top Mine, Fourmile, Custer Mining District, Custer County, South Dakota, USA