TREMOLITE

This article appears in Volume V27, Page 244 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: TOO-TUM

TREMOLITE , a member of the amphibole group of

rock

-forming minerals (see AMPHIBOLE). It is a

calcium

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

and magnesium metasilicate, CaMg3(SiO3)4, crystallizing in the monoclinic system with an

angle

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form, angus, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

of 55 49' between the perfect prismatic cleavages. It occurs sometimes as distinct crystals, but more usually as long bladed and fibrous forms. The colour is white or grey, but when iron is present it is green, then forming a passage to actinolite. The hardness is 5 a and the specific gravity 3.0. Tremolite is a characteristic

mineral

MINERAL

of crystalline limestones, especially dolomitic limestones, but also occurs as an alteration-product of olivine in basic igneous rocks. Typical specimens have long been known from the white crystalline dolomite of Campolongo in the St Gotthard region, Switzerland, near to which is the Tremola Valley, after which the

mineral

MINERAL

was named in 1796. Fine crystals are found in crystalline limestone at Gouverneur, Pierrepont and other places in New

York

YORK
YORK (
HOUSE
- HOUSE
- HOUSE (O. Eng. hiss, a word common to Teutonic languages, cf. Dut. huis, Ger. Haus; in
  Gothic
  - GOTHIC
  it is only found in gudhiss, a temple; it may be ultimately connected with the root of " hide," conceal)
OF)
YORK, EDMUND OF
LANGLEY
- LANGLEY, SAMUEL PIERPONT (1834-1906)
, DUKE OF (1341-1402)
EDWARD
- EDWARD
.html">YORK,
EDWARD
- EDWARD
YORK, FREDERICK
AUGUSTUS
- AUGUSTUS (a name 1 derived from Lat. augeo, increase, i.e. venerable, majestic, Gr. Ee0avr6s)
, DUKE OF (1763-1827)
YORK, RICHARD, DUKE

, and at several localities in Sweden. (L. J. S.)

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