SCOLECITE  , a See also:

• MINERAL

mineral belonging to the zeolite See also:

• GROUP

group; a hydrated See also:

• CALCIUM [symbol Ca, atomic weight 40.0 (o= x6)]

calcium silicate, CaAl2Si3Oio+3H20 . It is a See also:

• LIME
• LIME (O. Eng. lim, Lat. limes, mud, from linere, to smear)

lime-zeolite, and like the soda-zeolite See also:

• NATROLITE

natrolite and the soda-limezeolite mesolite, usually occurs as acicular and fibrous aggregations . Although having nearly the same interfacial angles as the orthorhombic natrolite, it crystallizes in the See also:

• MONOCLINIC

monoclinic See also:

• SYSTEM

system, and, as shown by the etched figures and the pyroelectric See also:

• CHARACTER (Gr. xapareri7p, from xap&crew, to scratch)

character, in the hemihedral class of this system, there being a See also:

• PLANE

plane, but no See also:

• AXIS (Lat. for " axle ")

axis, of symmetry . Scolecite can therefore be distinguished from natrolite by an See also:

• OPTICAL

optical examination, since the acicular crystals do not extinguish parallel to their length between crossed nicols . Twinning on the ortho-pinacoid is usually evident . The mineral is colourless or See also:

• WHITE
• WHITE, ANDREW DICKSON (1832– )
• WHITE, GILBERT (1720–1793)
• WHITE, HENRY KIRKE (1785-1806)
• WHITE, HUGH LAWSON (1773-1840)
• WHITE, JOSEPH BLANCO (1775-1841)
• WHITE, RICHARD GRANT (1822-1885)
• WHITE, ROBERT (1645-1704)
• WHITE, SIR GEORGE STUART (1835– )
• WHITE, SIR THOMAS (1492-1567)
• WHITE, SIR WILLIAM ARTHUR (1824--1891)
• WHITE, SIR WILLIAM HENRY (1845– )
• WHITE, THOMAS (1628-1698)
• WHITE, THOMAS (c. 1550-1624)

white, transparent, and vitreous in lustre: the hardness is 52, and the specific gravity 2.2 . It is a mineral of secondary origin, and occurs with other See also:

• ZEOLITES

zeolites in the amygdaloidal cavities of weathered volcanic rocks of basic See also:

• COMPOSITION
• COMPOSITION (Lat. compositio, from componere, to put together)

composition . See also:

• FINE

Fine divergent See also:

• GROUPS
• GROUPS, THEORY

groups of prismatic crystals are found in the See also:

• BASALT

basalt of Berufjord near Djupivogr in See also:

• ICELAND (Dan. Island)

Iceland and in the See also:

• DECCAN (Sans. Dakshina, " the South ")

Deccan traps near See also:

• POONA, or PUNA

Poona in See also:

• INDIA
• INDIA, FRENCH

India; hence the synonym poonahlite for this See also:

• SPECIES

species . The name scolecite is derived from Gr. arcwAnE, a See also:

• WORM

worm, because the crystals sometimes curl up like See also:

• WORMS

worms when heated before the See also:

• BLOWPIPE

blowpipe . (L . J .