The Morphology of Hydrothermally Grown Plagioclase

✍ Scribed by W. Franke; H. Ghobarkar

• Publisher: John Wiley and Sons
• Year: 1982
• Tongue: English
• Weight: 346 KB
• Volume: 17
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170170410

✦ Synopsis

Abstract

Plagioclase crystals Ab~20~An~00~ and nearly pure anorthite were grown on the surface of artificial melts by hydrothermal treatment at 2 kb. The average crystal size was 0.002 to 0.008 mm. In the temperature range of 400° to 600°C a pseudohexagonal habit was observed for anorthite while a lath‐like habit due to the prevalence of {010} was found for the Ab~20~An~80~ composition. Dominating faces are {010} {130} {110} {100} {110} {130} in the zone [001] and {021} {111} {111} {021} {111} {111} together with {001}.