Stevensite

Stevensite is a white clay mineral composed of hydrated calcium, sodium and magnesium silicate, with the chemical formula (Ca,Na)_xMg_3-x(Si₄O₁₀)(OH)₂.^[3] The mineral is a member of smectite.^[2] The mineral is named after Edwin Augustus Stevens.^[2]

Stevensite
General
Category	Minerals
IMA symbol	Stv[1]
Identification
Color	White, pale yellow, pale brown, pale pink
Mohs scale hardness	2 1/2[2]
Streak	White

Stevensite can be found at the Dean Quarry.^[4]