3o8 
METALS. 96. Tungftenum. 
calcariutn^ 
t^agntiia- 
turn. 
9^‘"rUNGS TENUM. Greyifh orbrownifl-ijinternallf 
fteel-white, very brittle and hard, not attradteci 
by the magnet, fpecific grav.tv i7,6oo: fufing 
with great difficnirv, gradually changing from 3 
black to a yellow oxvde when heated, which 
with the addition of microcofmic fait is at laft 
converted into a blue ghifs: foluble in the nitric 
acid into a yellow oxyde. T ungjien W oljram. 
Ponderous, lamellar, extremely brittle, ycllow'ifli-white 
or grey, ciigelled with hot nitric acid becoming yel- 
low. 
Jernftcn. CronH. mineral. zoS. 
Ferrum lapide vi;refc. Wall. f\li. z, p. 253, ». 7. 
Tunpften. Seheeie nov. AS. Stockh. 1781. />. 89. 
Stheelium. Karlen Lejke mirstr <•/. 575. 
Tanglteii. Kirvaav mineral. 2. p. 315- 
Tungftar of lime. 1 bomfnn them. 4. p. 1 1 3. 
Fount* rear Perputlh m I'ern^ Jl, in Saxony, and Bohemia, is 
tin minw-i. anti is often miftafcen for tin-llone, ioniftiines 
in ffivc or diflendnatfQ, fometimos iiyftallized in double 4- 
fidei pyraini<:s : it ciecrtpitatcs hut does not melt in a white 
heat with borax ii forms a colonriels glais, but if the borax 
excetd a brownifli one; fpecihc gravity from 3,800. t® 
6,028 ; contains, oxyde of tungllcn 70, lime 30. Scheele. 
Very pond' rons, lamellar, opake, of a blackifh-brown 
colour and reddilh brown Ifreak, forming a greetiiib 
glafs with borax. 
Motybda'num Xy/'. naf, xii. 3. p 123. n. 3. 
IWagnefia rrvflallirn. Wall f\sl. 1. p. 330. 
b: heeuum ochrareum. Karjle- Leshe mineral. 1. p. 
Wolfram K rnunn miner . z. p 316. 
M'ini? incfer>us w 'Ifram S hmeifi. min. z, p.z’pz. 
Wolfram. Thomfon chem. ^ p. ti4. 
Fonrd in Cor’-wall. Spain. Rntarj. Saxony, and Bohemia, in 
fn mines, inafliive or rryflallizcd in right ang ed 4-Cdcd 
taH-s, or 6 Tided compreffed prifms ending in 4-fided fum- 
m'ts; texture foliated, and eafilv feparated into plates b}' 
percuffion : it is infufible by the blowpipe, and forms a deep 
red glats with mtcrocofmic fait : fpecific gravity from 7,006, 
to 7.3 33 - containr oxyde of tungften 65, oxyde of roanganefe 
zz, oxyde of iron 13. Elhuyhart, 
