Über die Schmelztemperatur des Spodumen

Endell, Kurd; Rieke, Reinhold

doi:10.1002/zaac.19120740104

Cited by 12 publications

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“…SiO, ........... Spodumem.-Ths behaviour of spodumene on heating, and its relation t o the products obtained by fusing together silicates of lithium and of aluminium have been the subject of several investigations. 33 As regards its melting point, i t has been pointed out that the true melting point is the temperature a t which the substance passes from the anisotropic to the isotropic-amorphous condition. It has been found that in this mineral double refraction disappears in the case of fin0 powder after heating to 950O.…”

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confidence: 99%

Mineralogical chemistry

Hutchinson¹

1912

Annu. Rep. Prog. Chem.

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IN preparing this report the writ,er has folIotved on the whole the method of treatment adopted in that of last year, for as the material under discussion consists in the main of a number of entirely disconnected facts, the construction of a continuous narrative appeared neither easy nor indeed advisable, and has accordingly not been attempted. The object in view has been rather to present in some detail points of general interest, and to touch-lightly, or not a t all, on matters of little moment, or likely to appeal to none save specialists ; it is hoped, however, that nothing of great importance has been overlooked or omitted. Generul and P h y s i c a l Chemistry of Mi!nerats. Salt Deposits.-During the year, J. H. van't HoEl and his pupils have added seven more to the long series of papers on the I' Formation of Oceanic Salt Deposits." I n number XXXIX, the transformation of Glauber's salt, Na2S0,, 1 OH,O, into thenardite, Na,SO,, which takes place normally a t 32-4", is shown to occur a t lower temperatures if other salts are present. The limits of the existence of tachhydrite, CaCI2,2MgC1,,12H20, are set forth in number XL. The temperature of formation of potassium pentacalcium sulphate, K,Ca,(SO,),,H,O, is the subject of number XLI, that of glauberite, Na,SO,,CaSO,, of number XLII. The investigation, so far as calcium compounds a t 25" are concerned, is brought to a conclusion in number XLIII, and the composition of all constant solutions when saturated with the particular calcium salt with which the solutions are in equilibrium is tabulated. Tbe investigation of boron compounds and of the part played by calcium salts a t higher temperatures is now being begun. Number XLIV deals with the limit of existence of tachhydrite a t 83", and number XLV with the occurrence of tinkal, Na,B,O,,lOH,O, and of octahedral borax. The study of this important work has been greatly facilitated by

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Section: Iamentioning

confidence: 99%

Mineralogical chemistry

Hutchinson¹

1912

Annu. Rep. Prog. Chem.

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Bemerkung zu Herrn R. Marcs Erwiderung: Über die Schmelzpunkte von Silikaten

Dittler¹

1912

Zeitschrift für Elektrochemie und angewandte physikalische Chem

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Über das Verhalten des Spodumens beim Erhitzen

Brun

1912

Z. Anorg. Chem.

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Zur Arbeit der Herren I(. ENDELL und R. R m m l mochte ich bemerken, daB ich schon vor geraumer Zeitz zwischen einer Temperatur der Verfliissigung verschiedener Silikate und einer Temperatur der Zerstorung ihrer kristallinischen Struktur (destruction du r6seau) unterschieden habe. Speziell fur den Spodumen habe ich angegeben, daB er sich bei l O l O 0 in eigentumlicher Weise verandert. Er ist unter Volumenzunahme stark ausgedehnt, hat seine Kristallform beibehalten, zerfalk aber bei leichtem StoB in sehr feinen Staub. Die Temperatur von 1O1Oo habe ich nicht, wie die beiden Herren irrtiimlich angeben, als den Schmelzpunkt des Spodumens bezeichnet.

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Über die Schmelztemperatur des Spodumen

Cited by 12 publications

References 3 publications

Mineralogical chemistry

Mineralogical chemistry

Bemerkung zu Herrn R. Marcs Erwiderung: Über die Schmelzpunkte von Silikaten

Über das Verhalten des Spodumens beim Erhitzen

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