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Bob,
In my opinion, the head appears to be mid 20th c.
The crudeness of the rendering is not indicative of the careful craftsmanship of earlier works for a figure of this size - hair spirals would be well defined and all facial features would be much more refined.
As for the formation of cuprite, malachite, and azurite crystals, all of these can be artificially created in a short period of time.
In my experience, when these crystals form naturally, they do so in distinct layers, not clusters, and the individual crystals form much smaller so as to contour the form of the object.
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