Lisete Alves' Gallery

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Biotite
	Serra da Freita, Arouca, Aveiro District, Portugal Biotite Nodule in granite ( Specimen collected at what is known as "Pedra Parideira", or Birthing stone. The local people give this name because the mother-rock (granite) seems to "give birth" expelling smaller rocks (the biotite nodules)
	Photo ID: 20488 View Count: 595
Staurolite : (Fe²⁺,Mg,Zn)_1.5-2Al₉[O₆\|(OH,O)₂\|(SiO₄)₄]
	Serra da Freita, Arouca, Aveiro District, Portugal
	Photo ID: 20539 View Count: 314

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Lisete Alves' Gallery

Biotite

Staurolite : (Fe2+,Mg,Zn)1.5-2Al9[O6|(OH,O)2|(SiO4)4]

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Staurolite : (Fe²⁺,Mg,Zn)_1.5-2Al₉[O₆|(OH,O)₂|(SiO₄)₄]