Cerro Saraguasca volcano slag
© Žáček, Vladimír | 2003
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Ignimbrite, Jinotega
© Žáček, Vladimír | 2003
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Creased graphitic phyllite, Nicaragua
© Žáček, Vladimír | 2005
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Contact of phyllite and granite, Dipilto
© Žáček, Vladimír | 2005
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Torsion cracks in the phyllite, Nicaragu
© Žáček, Vladimír | 2005
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