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natroalunite
natroalunite n. 
/ˌnatrəʊˈal(j)ᵿnʌɪt/, /ˌnætroʊˈæl(j)əˌnaɪt/ [ < natro- comb. form + alunite n.] any of the range of hexagonal basic hydrated sulphates of sodium, potassium, and aluminium, (Na,K)Al3(SO4)2(OH)6, which have the proportion of sodium greater than that of potassium and are found as white crystals; spec. the sodic end-member of this series.
Brit. /ˌneɪtrəʊˈal(j)ᵿnʌɪt/
, /ˌneɪtrəʊˈal(j)ᵿnʌɪt//ˌnatrəʊˈal(j)ᵿnʌɪt/U.S. /ˌneɪtroʊˈæl(j)əˌnaɪt/
, /ˌneɪtroʊˈæl(j)əˌnaɪt//ˌnætroʊˈæl(j)əˌnaɪt/ΘΚΠ
the world > the earth > minerals > types of mineral > sulphates > [noun] > sulphates of two plus elements > basic
alumian1858
svanbergite1866
roeblingite1897
natroalunite1902
natrojarosite1902
plumbojarosite1902
tsumebite1913
1902 W. F. Hillebrand & S. L. Penfield in Amer. Jrnl. Sci. 164 220 The name natroalunite might be employed to designate the two varieties of alunite from Colorado.., where the proportion of the soda to the potash molecule is 7:4.
1937 Amer. Mineralogist 22 944 Small amounts of finely granular natroalunite have attacked the andalusite ores.
1969 Mineral. Abstr. 20 146/1 The first occurrence of natroalunite and natrojarosite from Argentina is noted from the area around La Flecha gorge.
1998 Jrnl. Cave & Karst Stud. 60 51 Hydrobasaluminite, like alunite and natroalunite, has formed as a by-product of the H2S-H2SO4 speleogenesis of Cottonwood Cave located in the Guadalupe Mountains of New Mexico.
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