Ken,
I can't say I've heard of montamite, may be a trade or product name. The
ball clay (sedimentary kaolin)operations around Bovey had a lot of lignite
so perhaps it's a clay product name ?
Alternatively and in view of the Bovey locality there's an outside chance it
could be a trade name for micaceous hematite ?
I'd be very doubtful about it being montanite.
Cheers
Ian Hodkinson
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