| Locality type: | Quarry |
| Classification |
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| Species: | 'Tourmaline' (not an IMA approved species) |
| Formula: | AD3G6 (T6O18)(BO3)3X3Z |
| Formation: | Primary |
| Comments: | While black tourmalines are common in the Dartmoor Granite, euhedral tourmaline crystals are not.
The miarolitic pockets within the granite are almost invariably lined with dark tourmaline crystals - seen as parallel growths, hair-fine single crystals and sheaves. The cavities are rarely larger than a few millimetres across, and the tourmalines are scaled to suit.
This type of late-stage tourmaline development is considered an indicator of potential rare-element mineralisation. |
| Habit: | Prismatic, filiform; sheaf-like growths; compact and massive |
| Colour: | pale olive green; greenish-brown; brown to black; black |
| Quality for species: | Poor for species, only of interest for locality collectors. (#) |
| Abundance at site: | Common |
| Confirmation |
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| Validity: | Believed Valid |
| Data |
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| Mineral Data: | Click here to view Tourmaline data |
| Locality Data: | Click here to view Foggintor Quarry, Princetown, Dartmoor Forest, West Devon, Devon, England, UK |
| Data Identifiers |
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| Mindat Occurrence Record ID: | 1103259 |
| Long-form Identifier: | 1:3:1103259:1 |
| GUID (UUID V4): | d7983d75-4950-4b30-a696-b17365139829 |
| Nearest other occurrences of Tourmaline |
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| 2.7km (1.6 miles) | ⓘMerrivale Quarry, Whitchurch, West Devon, Devon, England, UK |
| 3.4km (2.1 miles) | ⓘLittle Staple Tor, Whitchurch, West Devon, Devon, England, UK |
| 6.3km (3.9 miles) | ⓘEylesbarrow Mine (Wheal Ruth), Dartmoor Forest, West Devon, Devon, England, UK |
| 6.8km (4.2 miles) | ⓘFurzehill Mine (Furzehill Wood Mine), Horrabridge, West Devon, Devon, England, UK |
| 8.8km (5.5 miles) | ⓘNorth Mine, Brimpts Tin Mines, Dartmoor Forest, West Devon, Devon, England, UK |
| 9.2km (5.7 miles) | ⓘGreat Trowlesworthy Tor, Shaugh Prior, South Hams, Devon, England, UK |
| 9.2km (5.7 miles) | ⓘHooten Wheals (Hexworthy Mine), Hexworthy, Dartmoor Forest, West Devon, Devon, England, UK |
| 12.8km (7.9 miles) | ⓘMel Tor, Widecombe-in-the-Moor, Teignbridge, Devon, England, UK |
| 12.9km (8.0 miles) | ⓘRussell United Mine (incl. Wheal Russell), Gulworthy, West Devon, Devon, England, UK |
| 13.2km (8.2 miles) | ⓘHawkmoor Mine, Clitters United Mines, Gunnislake, Calstock, Cornwall, England, UK |
| References |
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| Reference Search (possible matching items) |
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 | | Journal (article/letter/editorial) | | 27 DARTMOOR DETRITALS A PROVENANCE. B y AL F RED B RAM~IALl, STUDY IN Ph.D. , D.Le. , F .G. S....detrital species , in Devon and Cornwall; others (e.g.• zircon, monazite, and tourmaline) are native to both...the West of England, and for some of these (e.g., monazite. and peculiar zoned zircons) a Dartmoor origin...though the same species occur also in other West of England granites. As a clue to provenance the varietal...es, but it is as yet un certain whether anyone Dartmoor speci es includes a variety which is at once distinctive |  | | Journal (article/letter/editorial) | | 25r THE DARTMOOR GRANITE. By ALFRED BRAMM.-\LL, Ph.D., lVI.Sc., D.Le., F.G.S. INTRODUCTION. DARTMOOR...relating to the geology of the West of England and to that of Dartmoor in particular is extensive. (See...Memoir. Later contributions to our knowledge of Dartmoor are mentioned on pp. 275-6 of this paper. Numerous...in addition to quartz and felspars : Abundant Tourmaline (many varieties), biotite. Subordinate .. Ilmenite... Priority for the discovery of garnets in the Dartmoor granite belongs to H. M. Evans (Trans. Devonshire |  | Reid, Clement, Barrow, G., Sherlock, R. L., MacAlister, D. A., Dewey, H., Bromehead, C. N. (1912) The Geology of Dartmoor. Memoirs of the Geological Survey. The Geological Survey | Report (issue) | | GEOLOGICAL SURVEY. ENGLAND AND WALES. EXPLANATION OF SHEET 338. TH.E GEOLOGY OF DARTMOOR. BY CLEJ\!IENT...includes a large part of the granitic masR of Dartmoor, and illustrates, better than any other, its relation...s11p plied at the cost of drawing and colot1ring: DEVON. 87. SE., by R. L. Sherlock. 88. SW., by R-. J...area of 216 square miles in Devon, including· the greater part of Dartmoor. No coast line 01· tidal estuary...Moor, ,vhich is the highest land in south-western England, dominates everythin_g. ·The geolog·y we have to |  | | Journal (article/letter/editorial) | | tourmalgne, rutile, brookite, and anatase in the Dartmoor granite. (With Plates iV and V.) By A. BI~AM.~IALL...1927.] H E range of temperature within which tourmaline can arise in nature has not hitherto been determined...appear ol~]y as secondary minerals. The status of tourmaline as a possible pyrogenic mineral is regarded as...by Ch~rke,! who states that ' in igneous rocks tourmaline ~eems to have been produced by fumarole action...separation from the magm,~ '. Within the Dartmoor area tourmaline is so widespread, and its modes of occurrence |  | | Journal (issue) | | Science, Plymouth Polytechnic, Plymouth, PL4 8AA, Devon. PROCEEDINGS OF THE USSHER SOCIETY VOLUME FOUR...Co., Kyrtonia Press, 115 High Street, Crediton, Devon CONTENTS CHAIRMAN'S REPORT......................formation of small-scale tectonic structures in south Devon (Abstract). By D.M. Hobson........................of the late Triassic - early Jurassic sequence in west Somerset. By G. Warrington.......................... 157 The Variscan granites of south-west England: a progress report. By J. R. Hawkes and J. Dangerfield |
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