They found that the pigment was created by combining indigo, a plant-based dye, and palygorskite, a type of clay. To the ancient Maya, the sinkhole, or the Sacred Cenote, at the site of Chichén ...

A review is presented of work carried out over the last 40 years on non-porous sorbents and on microporous shape-selective sorbents derived from palygorskite, smectite, and vermiculite. Among such ...

The new JV will not own the rights to any opals, palygorskite and iron ore that were dealt out to third parties previously. The two tenements subject to the new JV consist of four deposits ...

Cet article présente des mesures de conductivité thermique effectuées sur des argiles hautement compactées—smectite-Ca, smectite-Na, illite, palygorskite—en fonction de la densité (c'est à dire de la ...