M I N E R A L O G Y. 



503 



Jrjctogno- Nearly as hard as straight lamellar heavy-spar. Af- 



T- fords a greyish-white coloured streak. 

 ' ^ <""""' Ch-mtcal Characters. It burn? white before the 

 blowpipe ; and when rubbed or heated, gives out a 

 fetid sulphureous odour. 



CoiDlilutnt Par<. Sulphate of Barytes, 85.25 



Carbon 0.50 



Sulphate of Lime, 6.00 



Oxide of Iron, 5.00 



Alumina, 1.00 



Loss, including Moisture 



and Sulphur, 2.95 



100.00 



K/aproth, Beit b. v. g. 121. 



Grngnos/ic and Geographic Situations. It occurs 

 at Buxton in Derbyshire; at Kongsberg, and Andra- 

 rum in Norway. 



SIXTH SUBSPECIES. 



Tbnui FlBROvsHEAVY-SpAR, Jameson. Fasriger Schwers- 



*vj-spar. path, Werner. 



External Characters.- Colour pale-yellowish, and 

 wood.brown, which sometimes passes into yellowish- 

 grey. Occurs massive and reniform ; also in distinct 

 concretions, which are scopitbrm prismatic or fibrous, 

 sometimes collected into others, which are curved la- 

 mellar, and sometimes into coarse angulo-granular 

 concretions. Internally shining, and lustre resinous. 

 Fragments splintery, and wedge-shaped. Translucent 

 on the edge*. 



Specific gravity, 4.0SO, Ktaprolh i.239, Noegge~ 



TQjtk. 



Com fiit. Par/j. Sulphate of Brytcs, 99.0 



Trace of Iron. ' 99.0 



Klaproth, Beit. b. iii. s. 288. 



Geogrttttic and Geographic Situations. Found at 

 Neo-Le:ningen in tlie Palatinate ; also in an ironstone 

 mine in clay-slate, at Chanel-Fontaine, near Luttith, 

 in the Ourtne department ; and at Miess in Bohemia. 



SEVENTH SUBSPECIES. 



^ R \niATr.D HE\VY-SPAR, OR BOLOOXESE SPAR, 



..p.,'. Jamefi*. Bologncser Spath, It'einer. 



External Characters. Principal colour smoke-grey, 

 which paue* into ash-grey ana yellowish-grey. Oc- 

 curs in roundish piece*, which have lenticular aspect 

 and uneven surface; also in distinct concretions, which 

 are parallel and scopiform prismatic, and also granular. 

 Internally shining or glistening, and the lustre pearly, 

 inclining to re-inuu*. Fragments splintery, or wedge- 

 ihaped. Translucent. In other characters it agrees 



I with the preceding. 

 Gengnnslic and Geographic Situations It occurs 

 imliedded in marl in Monte Paterno, near Bologna : 

 also at Rimini ; and in Jutland. 



EIGHTH SUBSPECIES. 



t -r COLUMNAR HEAVY-SPAR, Jameson. Stangcnspath, 

 tftr. Werner. 



Ezternal Characters. Colours yellowish, greyish, 

 and grrrni>h-white, Occurs crystallized, in acicular 

 !<! pri<ms, which are always columnar- 

 and iiitt-rsect each other. Externally 

 with iron-ochre, but when unoili. 

 irly. Cleavage the same as that of 

 lamellar heavy-spar. Fragments indeterminate angu- 

 lar, and rather shar]>-edged Translucent. Specific 

 gravity, 4 500. 



Confluent Paris. Barytes, 



Sulphuric Acid, 

 Strontian Earth, 

 Oxide of Iron, 

 ' 



Lampadius. 



Gfognoslic and Geographic Situations. It was for- 

 merly found in the vein of Lorenzgegentrum, near 

 Frey'berg in Saxony, along with ores of different kinds, 

 and also fluor-spar, quartz, and straight and curved 

 lamellar heavy-spar. 



NINTH SUBSPECIES. 



PRISMATIC HEAVY-SPAR, Jameson. Saulenspath, 

 Werner. heavy.par. 



Exernal Characters. Principal colours grey, white, 

 greenish olive-green, flesh-red, and indigo-blue. Sel. 

 dom occurs massive, or in angulo-graiiular and pro- 

 miscuous prismatic concretions, gene-rally crystallized, 

 and in the following figures: 



1. Slightly obHquc lour-M<led prisic, rather acutely 

 bevelled on the extremities, and the bevelling planes 

 set on the acuter lateral edges. 2. Oblique four-sided 

 prism, rather acutely acuminated on tin 1 extremities 

 M itli four planes, which are set on the lateral edges. 

 S. Unequiangular six-sided prism, with two oppo- 

 site acuter lateral edge.s, and with the same terminal 

 bevelment and acuiniii.-U.ions as in figures 1 uiul -j. 

 4. Flat double four-iided pyramid, in which tin 

 ral planes of the one ore set on the lateral planes ot' the 

 other. 



Crystals middle-sized and small, and generally pro- 

 miscuously aggregated. Surface of crystals splendent, 

 and lateral planes transversely streaked. Internally 

 shining or splendent, and lustre pearly, inclining to 

 resinous. Alternates from translucent to semi-transpn- 

 rent. Specific gravity 4.i~l, Brcithaupt. 



Geognostic Situation. Occurs in veins, along with 

 fluor-spar, and ores of silver and cobalt; in gnti^. 

 mica-slate, and other primitive rocks. It is rare in 

 clay-slate, and very rare in secondary rocks. 



Geographic Situation. Occurs at Kongsberg in Nor- 

 way ; Mies in Bohemia; and Freyberg, Marienberg, 

 and Ehrcnfriedersdorf, in Saxony ; Roya in Auvergne. 



4. AXIFRANOIBLE BARYTE, OR CELESTINE, JatllCSOn. Axifrangi- 



Axentheilender Hal-Baryt, Mohs. Zolestin, Werner. lj'<-' tiwe, 



Prism = 104 48*. The most distinct cleavage jgorCeiw. 

 that at right angles to the axis of the prism ; another " ne< 

 less distinct cleavage is parallel with the lateral planes 

 of the prism. Hardness = 3.0 3.3. Sp. gravity = 

 3.6 4.0. 



This species is divided into five subspecies, viz. Fo- 

 liated Celestine, Prismatic Celestine, Fibrous Celestine, 

 Radiated Celestine, and Fine Granular Celestine. 



FIRST SUBSPECIES. 



FOLIATED CELESTINE, Jameton. Blattricher Celes- Foliated 

 tin, Kanlen. Schaaliger Zolestin, Werner. CeUctlne. 



External Characters. Its colours are milk-white, 

 blue, and red. Occurs massive ; also in lamellar dis- 

 tinct concretions, which are generally straight, or 

 slightly curved, and in which the surfaces are smooth 

 and shining ; and crystallized in the following figures : 

 1. Rectangular four-sided table, in which the terminal 

 planes are bevelled, and the lateral planes are truncated. 

 '.'. Rectangular four-sided table, bevelled on the termi- 

 nal edges. Crystals are middle-sized and small, and 



