Hello Dave,
Try http://webmineral.com, there you will find data on most minerals.
Peter
>From: [log in to unmask]
>Reply-To: Arch-Metals Group <[log in to unmask]>
>To: [log in to unmask]
>Subject: Akaganeite
>Date: Sat, 23 Dec 2006 14:52:36 -0700
>
>Does anyone know the optical characteristics of akaganeite (beta-FeO(OH)) -
>colour, bireflectance, anisotopy, extinction, internal reflections? I
>can't
>find them listed in the usual reference books for ore microscopy.
>
>I'm looking at some heavily corroded iron smelting slags and partly reduced
>ores
>from Senegal. Fissures and pores within these are filled with masses or
>concentric laminae of tiny crystals that are bright orange in transmitted
>PPL,
>distinctly bireflectant from pale to darker grey in reflected PPL (in air),
>and
>very strikingly anisotropic from dark grey to pale grey-blue in reflected
>XPL
>(in air). Internal reflections are orange-red. The same material is also
>often
>present in corrosion jackets around slags and partly-reduced materials.
>
>I'm very familiar with haematite, lepidocrocite and goethite in ores, but
>this
>material doesn't look like any of these.
>
>Any guidance?
>
>Dave Killick
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