Pencil garnet: from the Haramosh mountains near Gilgit, Pakistan.

From: The Mineralogical Record | Date: November 1, 2005| Author: Hawthorne, Frank C.; Pinch, William W. | Copyright information

Some unusual garnet crystals from the Haramosh mountains, near Gilgit, Pakistan, show what at first appears to be an impossible morphology for a garnet: a first-order hexagonal prism terminated by a second-order hexagonal pyramid. However, X-ray diffraction and chemical analysis confirm its identity as a garnet and the crystals are optically isotropic in cross-polarized light, indicating cubic symmetry.

INTRODUCTION

About 20 years ago, some very unusual crysta...

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