Mineralogia Cornubiensis

Fine clay and Talcy Granite, or Moorftone, used for Porcelain
manufactory-Grouan clay makes fine bricks for furnaces, &c.
-Of the crucible manufactory at Truro-The best crucibles

made there with clay and Moorftone gravel, 32. Salts, in-

fpiffated juices, faline, fulphureous, or acid-Vitriol, 33. Of

the blue Roman Vitriol made at Treleigh in Redruth, and the

process for making it, 33, 34. Afbeftos, or earth flax, in

Cornwall, 34. Arfenicks easily made from Mundick, 34.

Mundick to be used for preferving fhips bottoms from worms,

35.

Some Miners in Cornwall employed at sea in the fisheries,

or under-ground, 35. No payment, however poisonous, will

prevent the Teredo-worm from boring fhips bottoms, 36. The

author's preparation highly fubtilized and proposed to be infused

into the timber, 36, 37. Affay fluxes-Nitre-Tartar, 37.

Metals wafted by fluxes which may be faved in the large furnaces,

38. Of the Fluxus Niger, 38. Common falt, its ufe at the

furnace-Borax-Sandiver-Kelp-Their properties in fufing

of Metals, 39, 40. Sal Ammoniack, common glafs, Slaggs of

Metal, Charcoal, &c. 40. Minerals; Mundick, in all our

Metal Lodes; difficult to feparate from them, 41. continually

forming concretions; beautiful incruftations of them upon hex-

agonal Crystals-Proof that Metals and Minerals were not all

formed

formed at the creation, as we now find them, 42, 43. Of Cal,

Goffan, and Cockle-Cal, a hurtful mixture with Tin-Of

our Ochres-Defcription of Cockle, Talc, and Glift, 44, 45.

Bifmuth, natural hiftory of, how to affay it, 45, 46. Black-

Jack or Mock-Lead is a Zink Ore; ufeful ingredient in Brafs,

46, 47. Antimony, its hiftory, fufion, &c. in Cornwall, 47,

48, 49. Cobalt, natural hiftory of, 49, 50. Lapis Calami-

naris Metals, radical characters of Specifick weight, 51.

found pure among our Stream Tin, 52. diffolves in Aqua Regia

only, 52. Gold leaf will plate to the three hundred and fixty

thoufandth part of an inch thick-It never decays, &c. 53.

Platina, a Metal lately difcovered, nearest Gold in fixednefs and

folidity, but not fo ductile; differs from all other Metals, 54,

55. Quickfilver, often fophifticated-Of the Colick of the

Dunmonii, 55. Its volatility-Factitious Cinnabar-No Quick-

filver found in Cornwall, 56. what countries produce it—its

furprising infinuation into the minutia of the human body, 57.

Lead feldom pure, 57: Four forts of Lead in Cornwall, 57.

when discovered, of fhort continuance, 58. Lead anciently

known as a staple of England, 58. Silver feldom found in

Britain out of Lead-Of the Silver Mines in Europe-Of the

Mine of Potofi, 59. But four forts of Silver Ore-Silver per

too foft for use, 60. Copper, foluble in all menftrua-Native

Copper very common at fhallow levels-A lump of Native Cop-

per four tons in North-America, 61. Copper Ore in pureft

ftates, is Statactical, Guttatim, and Machacada-Of green and

blue Copper Ores-Grey Ore-Black Ore ought to be cautiously

dreffed, 62. Peacock Ore-Yellow Copper Ores four forts, 63.

Thirty thousand tons raised anno 1770-Cornish Copper Ores

the fource of great employ, 64. Iron, the product of most

countries-Sundry forts of Iron Ore-Caft Iron-Steel, 65.

Iron in all bodies-Most useful Metal to human life, 67. Tin

-Tin Ore called Tin-ftuff-Black Tin, 66. Of Native Tin,

the lightest of Metals, and the heavieft in a Mineral state-Of

Shode and Stream Tin, 66. Bal or Mine Tin-Of Tin Lodes

and Tin-stuff, 68. Trials of its purity-Various uses-Pewter

-Dying fcarlet, 69. Tin the only trade in Great-Britain two

thousand four hundred years ago-Little clfewhere-Of Molucca

Of the Strata of the Earth, and the Fiffures in which Metals

are found; their Direction, Inclination, or Underlie, &c.

JORNISH Strata of different denfities, and not stratified
by the laws of gravity, but by thofe of affinity, 72. ex-

plained and accounted for, 73. Soft Grouan Stratum encloses

Tin Lodes, 73. Slate-Killas, fix forts-The pale blue Killas

moft likely for Lodes of rich and lafting qualities-Elvan, two

forts, 74. Moorstone or Granite-its compofition-Five forts

of Moorftone, 75.
Ireftone, the hardest of all Strata, rich

Lodes of Copper in it, 76. On the formation of Fiffures in

general, 76. their various ufes in nature, 77. The opinions

of Woodward and Agricola controverted, 78. Of the caples or

walls of the Fiffure On the roughness or smoothness of the

walls of Lodes, 78. Breadth of a Lode or Fiffure, various-

Length or depth of a Fiffure, unlimited, 79. The direction of

Tin and Copper Lodes in Cornwall always eaft and weft, 80.

Their deflexion, inclination, or underlie, north or fouth, 80.

Of horizontal Lodes or Fiffures, called Flat-Lodes or Lode-

Plots-Of the Bunny or pipe of Ore, very uncommon in Corn-

wall, 31. Perpendicular, horizontal, and the inclined Fiffure,

fummarily accounted for, 82. A greater or leffer impetus of

the fame cause occafioned the Underlie, and the flide or heave

of a Lode, viz. the fubfidence of the earth, more or less at

repeated times, 83. Of the efficient causes of those fubfidencies,

83. The more lax and weaker Strata partially fubfided, and

the more compact and ftony formed hills, &c.

Incroachments

produced fecondary fubfidencies, and the Noachian flood occa-

fioned multiform fractures and dislocations of the Strata—The

fame evinced in St. Agnes-St. Agnes beacon a production of

Noah's flood-Although now a mountain, it was before the

flood the bottom of the fea-Its defcription, 84. That fome

parts of the prefent dry land were the bottom of the fea is the

opinion of fundry naturalifts-The highest mountain in perpen-

dicular height less than one-fix-thousandth part of the earth's

circumference, 85. Further fubfidencies caused by inundations,

earthquakes, and the diffolvent powers of fubterranean fire and

water,

water, 85. The foregoing hypothefis not without objections—

not infifted upon; but fubmitted with great deference to the

judgment of the naturalifts, 86.

С НА Р. II.

Of the different kinds of Lodes in refpect of the Earth and

Stones they contain.

OST Lodes are named from the Stone or Mineral they
generally abound with-Very different near the furface,

and in depth-Why Lodes in general are not rich near the surface,

87. Twelve general different kinds of Tin and Copper Lodes

Goffan Lodes moft common-described-a tender red, a

tender brown, 88. A dry pale Goffan, a poor Tin Goffan,

and a Kal or Kally Goffan-Kal very ferruginous, 89. A Peach

Lode, better for Tin than Copper; a Scovan Lode, productive

of Tin only; a Caple Lode; a Pryan Lode, very lax and fandy,

often rich, 90.
A Quartz Lode, very unkindly; a Crystal

Lode, four forts, 91, 92. A Killas Lode-Mundick Lode,

when likely, and when not, 92, 93. Black Jack, a Zinc Ore,

very shallow, better for Copper than Tin, good for neither-

Flookan Lode, likely for Tin or Copper, 93. Flookan in a

Crofs-Goffan prevents the circulation of water east and weft-

A Flookan east and weft parallel Lode heaves an oppofite under-

lying Lode higher up, 94. A Grouan Lode very foft or very

hard, better difpofed for Tin than Copper, 94. Different

Lodes, their alterations; which disposed for Tin, Copper, and

Lead-Mine Stones have their finufes or joints, 95. Of Stones

in Lodes foreign to their nature-The Elvan Stone, 95. The

Liver Stone-The Horse-description of-formation, 96. A

ftope of dead ground, 97.

CHA P. III.

How Lodes are disordered, interrupted, fractured, elevated, and

depreffed, by the Intervention of Cross-Goffans, Flookans,

Slides, Contras, &c.

Slide, not the cause, but the effect of a Heave-A Heave,
a falfe term, 97. Crofs-Goffan barren-runs north and

fouth-interfects all metallick Lodes, 98. How to find the

loft part, 99. Of the Clay or Flookan in a Cross-Goffan-dams

« السابقة متابعة »

كتب

Mineralogia Cornubiensis: A Treatise on Minerals, Mines, and Mining ...