
1) Calcium mineral 2) Magnesium mineral 3) Monoclinic mineral
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https://www.crosswordclues.com/clue/saponite

Saponite is a trioctahedral mineral of the smectite group. Its chemical formula is Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2·n(H2O). It is soluble in sulfuric acid. It was first described in 1840 by von Svanberg. Varieties of saponite are griffithite, bowlingite and sobotkite. It is soft, massive, and plastic, and exists in veins and cavities in serpentin...
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http://en.wikipedia.org/wiki/Saponite

• (n.) A hydrous silicate of magnesia and alumina. It occurs in soft, soapy, amorphous masses, filling veins in serpentine and cavities in trap rock.
Found on
http://thinkexist.com/dictionary/meaning/saponite/

clay mineral of the montmorillonite group. See montmorillonite.
Found on
http://www.britannica.com/eb/a-z/s/30
Sap'o·nite noun [ Swedish
saponit , from Latin
sapo ,
-onis , soap.]
(Min.) A hydrous silicate of magnesia and alumina. It occurs in soft, soapy, amorphous masses, filling veins in serpentine and cavities in trap rock.
Found on
http://www.encyclo.co.uk/webster/S/15

saponite A soft soapy clay mineral found in the veins and cavities of certain rocks that haave undergone hydrothermal alteration. Don't confuse this sap-, sapo- with another sap- which means, 'wise, wisdom' or sap-, sapo- which means, 'rotten, putrid'.
Found on
http://www.wordinfo.info/words/index/info/view_unit/1892/
No exact match found.