| Locality type: | Quarry |
| Classification |
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| Species: | 'Biotite' (not an IMA approved species) |
| Formula: | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Confirmation |
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| Validity: | Believed Valid |
| Associated Minerals Based on Photo Data: |
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| Muscovite | ⓘ1 photo of Biotite associated with Muscovite at this locality. |
| Quartz | ⓘ1 photo of Biotite associated with Quartz at this locality. |
| Data |
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| Mineral Data: | Click here to view Biotite data |
| Locality Data: | Click here to view Comley's Quarry, Germantown, Philadelphia, Philadelphia County, Pennsylvania, USA |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 967826 |
| Long-form Identifier: | 1:3:967826:2 |
| GUID (UUID V4): | 4cc3d628-de90-4617-bdf2-59c806ff2c14 |
| Nearest other occurrences of Biotite |
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| 2.0km (1.3 miles) | ⓘWissahickon Valley, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 2.3km (1.4 miles) | ⓘFowler's Quarry, Germantown, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 2.8km (1.7 miles) | ⓘGermantown, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 5.8km (3.6 miles) | ⓘRidge Avenue and School Lane Quarries, East Falls, Fairmount Park, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 5.9km (3.7 miles) | ⓘMiquon (Miquon Station; Lafayette; Lafayette Station), Whitemarsh Township, Montgomery County, Pennsylvania, USA |
| 9.3km (5.8 miles) | ⓘJerry O'Neill's Quarry, Tacony Creek Valley, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 9.3km (5.8 miles) | ⓘHoffman's Quarry (Hoffmans Quarry), Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 10.3km (6.4 miles) | ⓘClark's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 10.7km (6.6 miles) | ⓘBarber's Quarry, Frankford, Philadelphia, Philadelphia County, Pennsylvania, USA |
| 14.3km (8.9 miles) | ⓘHolmesburg Granite Company Quarry, Holmesburg, Philadelphia, Philadelphia County, Pennsylvania, USA |
| References |
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| Reference Search (possible matching items) |
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 | | Report (issue) | | DESCRIPTIVE MINERALOGY OF PENNSYLVANIA 104 Na 2Al 2 Si3 Oi .2H 2 O; SiO 2 47.4, A1 2 O 3 26.8, Na...Na 2 O 16.3, Lenni, Delaware County. Crystals. Eyerman, 1911, 11. Composition: Analysis: Fe 2 O3 CaO...Sp.gr LOCALITIES: Berks County: Birdsboro, and Gickerville; Delaware County: Leiperville, Lenni (druses...(Chester), and Ward's quarry; Montgomery County: Sumneytown, and Perkiomenville ; Philadelphia: Fairmount Park...Park, Frankford, and Rit- enhouse quarry. SCOLECITE CaAl 2 Si3 Oi .3H 2 O MONOCLINIC Transparent to |  | | Book (edition) | | 2005 in the UK, expressed as sales on an ex-works (quarry) basis as opposed to gross valued added, was £30...However, the value of mineral production on an ex-quarry basis does not truly reflect the ultimate value...national economy. The difference between the ex-quarry price and the delivered ptice of a tnineral can...goven1n1ent (counties and districts), MPAs are the county councils and National Park Authorities. In Scotland...Belfast, although du·ectory entries are shown by county to give an indication of geographical variations |  | | Book (edition) | | Gaswells. h-ont cover Operations at Shap Beck Quarry, Hanson Aggregates, North.em Region. © D Cameron...Ji'igures 1 An extract from Hunt's 1858 listing of Quarry Re turns 2 lJnited Kingdom production of n1inerals...2008 in the UK, expressed as sales on an ex-works (quarry) basis as opposed to gross valued addec~ was £41...However, the value of nlineral production on an ex-quarry basis does not truly reflect the ultin1ate value...the reader is cautioned against assunling that quarry naines are unique or iinnrntable. Where known, |
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