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RM3508   Stevensite and todorokite
(Ca,Na)xMg₃-x(Si₄O₁₀)(OH)₂
  -  9. Silicatos
#2931
Långban Mine, Långban Ore, Filipstad, Värmland, Sweden

This mineral species was first identified in Bergen Hill, New Jersey (USA). Stevensite is a rare phyllosilicate of the smectite group, with the formula (Ca,Na)xMg₃-x(Si₄O₁₀)(OH)₂. With black todorokite. This is an early specimen from Långban, Sweden. A systematic curiosity acquired from Shannon by E. Nicolau (Barcelona).

Size: 6.1 x 3.8 x 3.1 cm.
Ex. D. Shannon, Col. E. Nicolau.
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