Meddelelser om Grønland . ; the last four forms are only. Ilvaite, t\pe IX. 63 found in a single crystal, and are very small, but give rathergood reflexes. ?{33|} and ?!^{63l} are determined by lying inthe zone (431 :431) and by the angles: Measured Number of Calculatedvalue measurements value ? : (7 = (431): (331) = 7° 57 1 7° 49V2 £:*y --= (431): (631) = 9° 15 i 9° 26V2. ?{401} is determined by lying in the zones (101 :001) and(431 : 431), and further by the angles Measured Number of Calculatedvalue measurements value i:e = (401): (431) = 25° ? 1 25° 24V2 ?: ? = (401): (001) = 69° 37 I 69° 2
Meddelelser om Grønland . ; the last four forms are only. Ilvaite, t\pe IX. 63 found in a single crystal, and are very small, but give rathergood reflexes. ?{33|} and ?!^{63l} are determined by lying inthe zone (431 :431) and by the angles: Measured Number of Calculatedvalue measurements value ? : (7 = (431): (331) = 7° 57 1 7° 49V2 £:*y --= (431): (631) = 9° 15 i 9° 26V2. ?{401} is determined by lying in the zones (101 :001) and(431 : 431), and further by the angles Measured Number of Calculatedvalue measurements value i:e = (401): (431) = 25° ? 1 25° 24V2 ?: ? = (401): (001) = 69° 37 I 69° 24. The most characteristic feature of all the crystals is thehigh development of £(431); otherwise the other faces, whichare always, excepting the faces of the prismatic zone, verysmall, may be rather differently developed, and more or fewermay be wanting. All the crystals have very bright and shiningfaces, all, excepting £{43l}, giving verygood reflexes. Type X. To this belongs a rather large numberof crystals, showing in the details r
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgeology, booksubjects
