| Locality type: | Quarry |
| Classification |
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| Species: | Hydroxylapatite |
| Formula: | Ca5(PO4)3(OH) |
| Comments: | Frosty, translucent, pale yellow micro crystals encrusting pocket quartz, cleavelandite, and a much larger, glassy fluorapatite crystal. Originally labeled as calcite, but does not react to HCl, has hardness 5, no visible cleaveage, and does not fluoresce. |
| Habit: | elongated hexagonal prisms with rounded edges and terminations |
| Colour: | pale yellow with frosty terminations |
| Luminescent properties: | none |
| Abundance at site: | Very Rare |
| Confirmation |
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| Validity: | Confirmed |
| Confirmation Methods: | Visually Identified |
| Associated Minerals Based on Photo Data: |
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| Eosphorite | ⓘ6 photos of Hydroxylapatite associated with Eosphorite at this locality. |
| Fairfieldite | ⓘ2 photos of Hydroxylapatite associated with Fairfieldite at this locality. |
| Quartz | ⓘ1 photo of Hydroxylapatite associated with Quartz at this locality. |
| Lithiophilite | ⓘ1 photo of Hydroxylapatite associated with Lithiophilite at this locality. |
| Cleavelandite | ⓘ1 photo of Hydroxylapatite associated with Cleavelandite at this locality. |
| Sicklerite | ⓘ1 photo of Hydroxylapatite associated with Sicklerite at this locality. |
| Mitridatite | ⓘ1 photo of Hydroxylapatite associated with Mitridatite at this locality. |
| Muscovite | ⓘ1 photo of Hydroxylapatite associated with Muscovite at this locality. |
| Sphalerite | ⓘ1 photo of Hydroxylapatite associated with Sphalerite at this locality. |
| Data |
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| Mineral Data: | Click here to view Hydroxylapatite data |
| Locality Data: | Click here to view Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield County, Connecticut, USA |
| Photo Gallery | View Gallery (2 photos) |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 728710 |
| Long-form Identifier: | 1:3:728710:7 |
| GUID (UUID V4): | 003bb840-16a4-4257-881f-ece374e61721 |
| Nearest other occurrences of Hydroxylapatite |
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| 79.3km (49.3 miles) | ⓘStrickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex County, Connecticut, USA |
| 81.4km (50.6 miles) | ⓘState Forest Quarry No. 2 (State Forest #2 Mica Mine; Carini Quarry), Cobalt, East Hampton (Chatham), Middlesex County, Connecticut, USA |
| 97.6km (60.6 miles) | ⓘFranklin Mine, Franklin, Sussex County, New Jersey, USA |
| References |
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Fillow Quarry, Branchville, Redding, Fairfield County, Connecticut, USA