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Spix & Von Martius

Near Villa Rica

Topazes in an earthy talc (decomposed rocks) "incumbent' in Elastic quartz & iron mica Slate) "immense layers of a modified mica" occur in porcelain earth & decomposed mica, detached rock crystal – also found in parts of formation still solid – generally in quartz veins Euclase found with topaz – iron glance – crystals in this formation of decomposed mica always detached, & often in fragments: (NB colour of mass must be mottled): yet not a secondary formation; certainly thinks is like some of the Porcelain earths, primitive: - the fragments of the crystals aggregated together: Eschwege thinks basis of Topaz. Chlorite Slate; Spix does not agree. – Mawe thinks in veins in Clay Slate impressions on Topazes & Euclase of fine scales of Lithomarge. Thinks Mr Zinker. Thinks cavities with these crystals have collapsed & so fractured them.

Pyenite, Enamels occur in parts of Germany in flötz formation of similar kinds

Quartz crystals marked with those of Topaz, do scales of mica, with iron glance –

All these remarks by Rev. Wagner

 

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I defy any one (P 186) to understand position of iron stone flotz [insertion:] tapanho-acanga, (which is said to occur at Goyaz. St Pauls, Bahia, & is believed always to contain gold – appears to contain rounded fragm yet appears to graduate into the underlying iron – mica slates, (which are equally incomprehensible) – contains lithomarge.

Eschwege calls Tapanho-acanga calls Alluvial rock. (mica like?)

Spix calls Quader-sandstein evidently so!!!

D. Pohl considers Elastic strata alluvial!

Humboldt as Primitive Wagner appears to consider Topaz rocks connected with these oldest beds

These clearly are auriferous quartz veins – in quarts

I should think iron stone flötz was alluvial yet he talks of crystallized gold in this Quadersandstein

Most [inex] friable disgraceful confusion