374 ' TENORITE. 



Occurs ' crystallized in rlioiTibic dodecahe- 

 drons, sometimes variously modified ; also in 

 cubes and octahedrons, of "which the edges 

 and angles are replaced. Twins. Rarely 



Fig. 425. Fig. 426. 



found massive. Colour lead-grey, inclining 

 to iron-black. Opaque. Lustre metallic. 

 Streak dark reddish-grey. Brittle. Frac- 

 ture imperfectly lamellar and uneven. H. 

 5-0 to 4. S.G. 4-37 to 4-5. 



Comp. (Cu Fe) S + As2 S3 = copper 46-68, 

 arsenic 19*90, iron 3-71, sulphur 29-71 = 100. 

 Analysis, from Cornwall, by Phillips : 

 Copper .... 47-70 

 Arsenic , . . . 12-46 



Iron 9-75 



Sulphur .... 30-25 



100-16 



BB decrepitates, burns with a blue flame, 

 giving off arsenical fumes, and fuses to a 

 magnetic slag. 



Soluble in nitric acid. 



Localities. — English. Cornwall : Carn 

 Brea ; East Relistian Mine ; Dolcoath ; 

 Roskear; Cook's Kitchen ; Tincroft; Huel 

 Jewel ; Huel Unity ; Trevascus, &c. — 

 Foreign. Skutterud, in Norway. Algeria. 



Name. After Smithson Tennant, chemist. 



Brit. Mus., Case 7. 



M. F. G. Principal Floor, Wall-case 7, 

 Nos. 543 to 547 (British). 



Tenorite, Semmola. Occurs in small 

 hexagonal and sometimes triangular laminte, 

 attached by their edges; sometimes obli- 

 quely — never flat; also earthy, and as a 

 black powder. Colour dark steel-gre3% in- 

 clining to black. Opaque; slightly trans- 

 lucent and broAvnish in thin folia. Lustre 

 metallic. Streak black. Elastic. 



Comp. Protoxide of copper, or Cu = cop- 

 per 79-85, oxygen 20-15 = 100. 



BB on charcoal, fuses to a red globule 

 (generally covered with a black scoriaceous 

 crust), which dissolves with effervescence in 

 nitric acid. With borax, yields an emerald- 

 green glass. Colours the flame of a spirit 

 lamp slightly green. 



Locality, 'in the lava of Vesuvius ; in the 

 crater and the outlets of extinct or active 

 eruptions. It is most frequently accom- 

 panied by Common Salt, and is evidently 



TERRA CIMOLITA. 



produced by sublimation, being always 

 superimposed on other sublimed substances. 



Name. After Tenore, a celebrated Italian 

 botanist, and President of the Neapolitan 

 Academy of Sciences. 



Brit. Mus , Case 17. 



Tephkoite, Breithaupt, Mohs, Dufrenoy. 

 Occurs in compact crystalline and granular 

 masses, with a cleavage parallel to the sides 

 of a square or rectangular prism. Colour 

 ash-grey, turning black on exposure. Lustre 

 adamantine. Streak paler then the colour. 

 Fracture imperfect- conchoidal or uneven. 

 H. 5-5 to 6. S.G. 4 to 4-116. 



Comp. Silicate of protoxide of manganese, 



or MnS Si = protoxide of manganese 70-2, 



silica 29-8 = 100. 



Analysis, from Sparta, by Rammelsberg : 



Silica 28-66 



Protoxide of manganese . 68-88 

 Protoxide of iron . . 2-92 



100-46 

 ^S fuses readily to a black slag. 

 Soluble in muriatic acid (without evolu- 

 tion of chlorine), forming a jelly of silica. 



Localities. Stirling, Sparta, and New 

 Jersey, with Franklinite and Red Zinc. 

 Name. From riip^o;^ ash-grey. 

 Brit. Mus., Case 26. 



Teratolite, Glocker. Compact and 

 earthy. Colour pale violet to bluish-grey ; 

 often with reddish -white veins and spots. 

 Opaque. Dull. Rough and meagre to the 

 touch. Fracture uneven, earthy to flat- 

 conchoidal. H. 2-5 to 3. S.G. 2-5. 

 Analysis, by Schiikr : 



Silica 41-66 



Alumina .... 22*85 

 Peroxide of iron . . 12-98 

 Peroxide of m.anganese . 1-68 



Lime 3-04 



Magnesia .... 2-56 

 Potash . . . .0-93 

 Water .... 14-20 



99-89 



BB infusible. With borax gives an iron 

 reaction. 



Locality. Planitz, near Zwickau, in 

 Saxony ; in beds in the coal formation. 



Brit. Mus., Case 25. 



Teratolite is the Terra Miraculosa SaxonicB 

 of old authors ; which was valued on ac- 

 count of its supposed medicinal properties. 



Terenite, Emmons, Dufrenoy. (From 

 Tipviv, tender.) An altered form of Scapolite. 



Ternarbleierz. See Leadhillite. 



Terra Cimolita. See Cemolite. 



