VIVIANITE  , a See also:

• MINERAL

mineral consisting of hydrated See also:

• IRON [symbol Fe, atomic weight 55.85 (0=16)]

iron phosphate Fe3(PO4)2+8H20, crystallizing in the See also:

• MONOCLINIC

monoclinic See also:

• SYSTEM

system . The crystals possess a perfect cleavage parallel to the See also:

• PLANE

plane of symmetry and are usually bladed- in See also:

• HABIT (through the French from Lat. habitus, from habere, to have, hold, or, in a reflective sense, to be in a certain condition; in many of the English senses the French use habitude, not habit)

habit; they are soft (H = z ~, flexible and sectile The specific gravity is 2.6 . When unaltered and containing no ferric See also:

• OXIDE

oxide, the mineral is colourless, but on exposure to 'the See also:

• LIGHT

light it very soon becomes of a characteristic See also:

• INDIGO (earlier indico, from Lat. indicum, the Indian sub-stance or dye; the Sans. name was niti, from nila, dark blue, and this through Arab. al-nil, annil, gives " aniline ")

indigo-See also:

• BLUE (common in different forms to most European languages)

blue See also:

• COLOUR (Lat. color, connected with celare, to hide, the root meaning, therefore, being that of a covering)

colour . Crystals were first found in See also:

• CORNWALL

Cornwall (at Wheal Jane, near See also:

• TRURO
• TRURO, THOMAS WILDE, 1ST BARON (1782-1855)

Truro, associated with See also:

• PYRRHOTITE

pyrrhotite) by J . G . See also:

• VIVIAN, RICHARD HUSSEY VIVIAN, 1ST BARON (1775—1842)

Vivian, after whom the See also:

• SPECIES

species was named by A . G . See also:

• WERNER, ABRAHAM GOTTLOB (1750-1817)
• WERNER, ANTON ALEXANDER VON (1843– )
• WERNER, FRIEDRICH LUDWIG ZACHARIAS (1768–1823)

Werner in 1817 . The mineral had, however, been earlier known as a blue powdery substance, called " blue iron-See also:

• EARTH
• EARTH (a word common to Teutonic languages, cf. Ger. Erde, Dutch aarde, Swed. and Dan. jord; outside Teutonic it appears only in the Gr. 'pq'e, on the ground; it has been connected by some etymologists with the Aryan root ar-, to plough, which is seen in
• EARTH, FIGURE OF
• EARTH, FIGURE OF THE

earth," met with in See also:

• PEAT (possibly connected with Med. Lat. petia, pecia, piece, ultimately of Celtic origin; cf. O. Celt. pet, O. Ir. pit, Welsh peth, portion)

peat-bogs, in See also:

• BOG (from Ir. and Gael. bogach, bog, soft)

bog iron-ore, or with fossil bones and shells . (L . J .