Quartz from Ilha claim, Taquaral, Itinga, Minas Gerais, Brazil - image 1

Quartz from Ilha claim, Taquaral, Itinga, Minas Gerais, Brazil

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Guimarãesite is an extremely rare calcium beryllium zinc phosphate hydroxide hydrate described in 2007 from an occurrence in Piauí valley, Taquaral, Itinga, Minas Gerais, Brazil. Ponte do Piauí claim, just 700 metres away in Piauí valley, is the second world occurrence and is where this specimen is from. It comprises a single 7 cm tall slightly milky Quartz crystal - the Guimarãesite occurring as dark brown 1 to 2 mm diameter rounded crystal aggregates clustered upon the surface of the Quartz crystal at its base. It comes from the remarkably comprehensive systematic collection assembled by brothers Martin and Michael Günther (1951-2007 & 1956-2021).

Product details

SpeciesQuartz
SizeSmall Cabinet
Dimensions7.0 x 4.0 x 2.2 cm
Added on05/14/2025
LocalityBrazil, Minas Gerais, Ilha claim

Owners

Unknown Owner
Current owner
Acquired
Jul 2026
Price paid
$600.00

Learn more

Quartz
Mineral guide
Learn about Quartz
a versatile mineral with clear, milky, and colored varieties; crystal forms, formation clues, and tips for identifying amethyst and citrine.
Quartz
Regional guide
Quartz from Ilha claim
Contribute
Locality guide
Ilha claim
A collector's guide to Ilha claim, Brazil: its geology, mining history and notable minerals, illustrated with the 142 specimens documented from this locality on EarthWonders.