APOPHYLLITE  , a See also:

• MINERAL

mineral often classed with the See also:

• ZEOLITES

zeolites, since it behaves like these when heated before the See also:

• BLOWPIPE

blowpipe and has the same mode of occurrence; it differs, however, from' the zeolites proper in containing no See also:

• ALUMINIUM (symbol Al; atomic weight 27.0)

aluminium . It is a hydrous See also:

• POTASSIUM [symbol K (from kalium), atomic weight 39.114 0=16)]

potassium and See also:

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

calcium silicate, H7KCa4(Si02)s+44H20 . A small amount of See also:

• FLUORINE (symbol F, atomic weight 19)

fluorine is often See also:

• PRESENT

present, and it is one of the few minerals in which ammonium has been detected . The temperature at which the See also:

• WATER

water is expelled is higher than is usually the See also:

• CASE
• CASE, JOHN (d. 1600)

case with zeolites; none is given off below 2000, and only about See also:

• HALF

half at 250°; this is slowly reabsorbed again from moist See also:

• AIR (from an Indo-European root meaning " breathe," " blow ")
• AIR, or ASBEN

air, and is therefore regarded as water of See also:

• CRYSTALLIZATION

crystallization, the See also:

• REMAINDER, REVERSION

remainder being water of constitution . When heated before the blowpipe, the mineral exfoliates, owing to loss of water, and on this See also:

• ACCOUNT
• ACCOUNT (through O. Fr. acont, Late Lat. comptum, cornputare, to calculate)

account was named apophyllite by R . J. flatly in 1806, from the See also:

• GREEK
• GREEK, ETRUSCAN AND

Greek afro, from, and OilMov, a See also:

• LEAF (O. Eng. leaf, cf. Dutch loof, Ger. Laub, Swed. lof, &c.; possibly to be referred to the root seen in Gr. Ma-eta, to peel, strip)

leaf . Apophyllite always occurs as distinct crystals, which belong to the tetragdilal See also:

• SYSTEM

system . The See also:

• FORM (Lat. forma)

form is either a square See also:

• PRISM (Gr. rrpivµa, properly a thing sawn, Irpii"ety, to saw)

prism terminated by the basal planes (fig . 2), or an acute See also:

• PYRAMID

pyramid (fig . I) . A promi- nent feature of the mineral is its perfect basal cleavage, on which the lustre is markedly pearly, present- See also:

• ING

ing, in 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 crystals, some- what the See also:

• APPEARANCE (from Lat. apparere, to appear)

appearance of the See also:

• EYE
• EYE (O. Eng. edge, Ger. Auge; derived from an Indo-European root also seen in Lat. oc-ulus, the organ of vision (q.v.)

eye of a See also:

• FISH (O. Eng. fist, a word common to Teutonic languages, cf. Dutch visch, Ger. Fisch, Goth. fisks, cognate with the Lat. piscis)
• FISH, HAMILTON (1808-1893)

fish after The See also:

• OPTICAL

optical characters of the mineral are of See also:

• SPECIAL

special See also:

• INTEREST

interest, and have been much studied . The sign of the See also:

• DOUBLE
• DOUBLE (from the Mid. Eng. duble, the form which gives the present pronunciation, through the Old Er. duble, from Lat. duplus, twice as much)

double See also:

• REFRACTION
• REFRACTION (Lat. refringere, to break open or apart)

refraction may be either See also:

• POSITIVE (or PORTABLE) ORGAN

positive or negative, and some crystals are divided into optically biaxial sectors .

The variety known as leucocyclite shows, when examined in convergent polarized See also:

• LIGHT

light, a See also:

• PECULIAR

peculiar interference figure, the rings being alternately white and See also:

• VIOLET

violet-See also:

• BLACK
• BLACK, ADAM (1784-1874)
• BLACK, JEREMIAH SULLIVAN (1810–1883)
• BLACK, WILLIAM (1841-1898)

black and not coloured as in a normal figure seen in white light . Apophyllite is a mineral of secondary origin, commonly occurring, in association with other zeolites, in amygdaloidal cavities in See also:

• BASALT

basalt and melaphyre . Magnificent See also:

• GROUPS
• GROUPS, THEORY

groups of greenish and colourless See also:

• TABULAR

tabular crystals, the crystals several inches across, were found, with flesh-red stilbite, in the See also:

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

Deccan traps of the Western See also:

• GHATS, or GHAUTS (literally " the Landing Stairs " from the sea, or " Passes ")

Ghats, near Bombay, during the construction of the See also:

• GREAT

Great See also:

• INDIAN

Indian See also:

• PENINSULAR

Peninsular railway . Groups of crystals of a beautiful See also:

• PINK

pink See also:

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

colour have been found in the See also:

• SILVER

silver See also:

• VEINS

veins of Andreasberg in the Harz and of Guanaxuato in See also:

• MEXICO
• MEXICO (Span. Mejico, or Mexico,)
• MEXICO, FEDERAL DISTRICT OF
• MEXICO, GULF OF

Mexico . Crystals of See also:

• RECENT

recent formation have been detected in the See also:

• ROMAN

Roman remains at the hot springs of Plombieres in See also:

• FRANCE
• FRANCE, ANATOLE (1844– )

France . (L . J .