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pycnochlorite
pycnochlorite n.
Brit. 
/ˌpɪknə(ʊ)ˈklɔːrʌɪt/
, /ˌpɪknə(ʊ)ˈklɔːrʌɪt/U.S. /ˌpɪknəˈklɔˌraɪt/
[after German Pyknochlorit (J. Fromme 1903, in Mineral. u. petrogr. Mitteilungen 22 70)] Mineralogy a mineral of the chlorite group having the same composition as clinochlore except for a higher proportion of iron.Formula: (Mg,Fe2+,Al)6(Si,Al)4O10(OH)8, with 1·5–3 atoms of iron per formula unit./ˌpɪknəˈklɔˌraɪt/ΘΚΠ
the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > chlorite > clinoclore
leuchtenbergite1844
ripidolite1844
clinochlore1851
kochubeïte1868
pycnochlorite1903
sheridanite1912
1903 Mineral. Mag. 13 375 Pyknochlorite... A greyish-green, compact chlorite occurring in a quartz and calcite vein in the gabbro of the Radauthal, Harz. It has the same general formula..as clinochlore, but differs from this in containing much more ferrous iron and in its compact (πυκνός) texture.
1960 Amer. Mineralogist 45 797 The co-existing chlorite occurs in fairly large pale green crystals and..following the classification of Hey (1954) it may be termed a pycnochlorite, with Fe (total): (Fe + Mg) = 0·273 and Si 2·83, on the basis of 14 oxygens (anhydrous).
2004 Jrnl. Volcanol. & Geothermal Res. 138 149/1 Chlorites of zone II range from pycnochlorites to diabantites and have Mg/(Mg+Fe) ratios between 0.62 and 0.69.
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