Corsi 706, approx. 145 x 73 x 40 mm, © Oxford University Museum of Natural History
| OUMNH Number: | 706 |
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| Name and quarry location: | Orthoclase 'adularia', from the Alps; probably from St Gotthard, Ticino, Switzerland |
| Geological description: | Adularia, a variety of orthoclase feldspar. |
| Comments: | This specimen does not have the characteristic milky schiller of the variety of adularia called moonstone. It is part of a large single crystal, and is composite, a reverse corner added to make the specimen the required size. It is almost certainly from one of several Alpine localities including St Gotthard, Ticino, Switzerland. Adularia is a very characteristic mineral of Alpine assemblages but rarely shows the fine schiller shown by the moonstones which in Corsi's time, would have been found in Ceylon (Sri Lanka) |
| References: | Corsi (1845) 255 |
| Further information: |
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| Corsi's classification: | Class 13. Feldspars; Species 3. Moonstone |
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| Corsi's text: | 173 Adularia... chiamasi... dal nome antica di Adula col quale venivia indicata la catena delle Alpi, in cui è la montagna di S. Gottardo; pietra lunare |