Prospecting in Nova Scotia · 2014-07-02 · Minerals of Nova Scotia The following slides present...
Transcript of Prospecting in Nova Scotia · 2014-07-02 · Minerals of Nova Scotia The following slides present...
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Prospecting in Nova Scotia
Minerals of Nova Scotia
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Minerals of Nova Scotia
The following slides present photographs and properties of Nova Scotia minerals of interest to prospectors.
The mineral properties described here relate to those defined in the “Identifying Minerals” module and it is recommended that you view that module first.
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Nova Scotia Minerals• Arsenopyrite• Barite• Calcite and dolomite• Cassiterite• Chalcopyrite• (Native) copper • Galena• Gold• Gypsum• Hematite• Limonite
• Magnetite• Molybdenite• Pyrite• Pyrolusite• Pyrrhotite• Quartz • Salt• Scheelite• Sphalerite• Stibnite• Zeolites
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• Hardness: (5) Can scratch with knife; brittle, forms powder when struck
• Shape: Forms prisms, diamonds • Colour: Steel gray to silver white• Lustre: Metallic • Reaction with acid: No• Magnetic: No• Streak: Black• Other: Garlic-like smell when struck,
striations on surfaces are characteristic• Location: Common at gold occurrences
Arsenopyrite (FeAsS)
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Barite: (BaSO4)Barium sulfate• Hardness (3-3.5): Scratch with knife, brittle• Shape: Massive, Forms blades• Colour: White, Colorless, light blue, yellow,
grey, brown• Lustre: Vitreous• Reaction with acid: No• Magnetic: No• Streak: White• Other: Heavy (SG 4.8), Used for drilling
muds in oil exploration• Localities: Walton, Lake Ainslie
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Cassiterite: (SnO2) Tin ore• Hardness (6-7): Can not scratch with knife;
brittle, powder brown to white• Shape: Forms prisms, needles • Colour: Black, brownish black, reddish
brown, red, yellow, gray, white; rarely colorless
• Lustre: Lustre like diamond • Reaction with acid: No• Magnetic: No• Streak: brownish white• Other: Heavy (SG 7)• Localities: granites; East Kemptville
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Chalcopyrite (Chalk-o-pyrite) (CuFeS2) Copper Ore• Hardness: Scratch with knife; brittle,
forms powder when struck• Shape: Forms triangular crystals• Colour: Bronze-honey yellow,
surface tarnishes to rainbow colours• Lustre: Metallic • Reaction with acid: No• Magnetic: Weakly magnetic, powder
sticks to magnet • Streak: Greenish black streak• Other: Common Copper ore• Location: Copper Lake
• ;
Chalcopyrite tarnished
Chalcopyrite
Pyrite
Copper Lake
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Native Copper (Cu)• Hardness:can be easily scratched by needle,
penknife. Malleable: edges bend.• Shape: Hackly: rough jagged surface• Colour: Copper, tarnishes green or black• Lustre: Metallic • Reaction with acid: No• Magnetic: No• Streak: Copper• Location: Common in North Mountain and around
Bay of Fundy – Minas Basin; in dark volcanic rocks; with zeolites and quartz
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Galena (PbS) Lead Ore• Hardness: Can be scratched by copper coin,
very brittle• Shape: Forms cubes, masses• Colour: Lead gray, silvery • Lustre: Metallic • Reaction with acid: No• Magnetic: No• Streak: Greenish black streak• Other: Heavier than fools gold • Localities: Dunbrack Mine, Musquodoboit;
Gays River, Hants County; Yava Mine, Cape Breton; Jubilee, Cape Breton
Gays River, Hants County
Galena
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• Hardness: Soft, easily scratched with a knife, malleable.
• Shape: Generally irregular, hackly • Colour: Bright gold yellow, • Lustre: Metallic • Reaction with acid: No• Magnetic: No• Streak: gold• Other: Very heavy;19 times heavier than
water; 7 times heavier than rock; 4 times heavier than fools gold
• Location: Common on Eastern Shore
Gold (Au)
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Gypsum (CaSO4) Calcium Sulphate• Hardness (1): Very soft; can be scratched
by fingernail• Shape: Massive, long and prismatic crystals• Colour: Colourless to white• Lustre: Dull to Vitreous• Reaction with acid: No• Magnetic: No• Streak: White• Other: Flexible; used in plaster & fertilizer• Localities: Windsor, Carrols Corner
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Hematite (Fe2O3) Ore of Iron • Hardness (6): Same as knife; brittle, powder
red-brown• Shape: Forms flakes, kidney-shaped masses• Colour: Metallic gray to dark red• Lustre: Metallic• Reaction with acid: No• Magnetic: After heating• Streak: Reddish brown• Other: Heavy (SG 5) An ore of iron, used as
red pigment• Localities: Found near Nictaux Falls,
Torbrook, Bridgeville, Londonderry
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Limonite, (rust) FeO(OH)·nH2O• Hardness (1-5): Scratch with knife; brittle, • Shape: Massive• Colour: Yellowish brown• Lustre: Dull to earthy• Reaction with acid: No• Magnetic: No• Streak: Yellowish brown• Other: Heavy (SG 5) Used as pigment.
Rusting of iron sulfides at surface (gossans) can be a guide to sulfide mineralization
• Localities: Once mined at Londonderry
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• Hardness (5.5-6.5): Same as knife knife; brittle, powder black
• Shape: Blocky or massive• Colour: Grey - Black• Lustre: Metallic• Reaction with acid: No• Magnetic: Yes, strongly • Streak: Black• Other: Heavy (SG 5)• Localities: Found in Economy
Mountain
Magnetite (Fe3O4) Ore of iron
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Molybdenite: (MoS2) Molybdenum Ore• Hardness: (1) Soft, scratch with fingernail,
brittle• Shape: usually platy form• Colour: Lead grey• Lustre: metallic• Reaction with acid: No• Magnetic: No• Streak: Greenish grey• Other: Can write on paper (like graphite),
black powder with greasy feel• Localities: In granites in southern Nova
Scotia and at Coxheath in Cape Breton
Coxheath, NS
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Pyrite (FeS2)• Hardness: (6.6.5) Can’t scratch with
knife; brittle, forms black powder when struck
• Shape: Forms cubes • Colour: Brass yellow• Lustre: Metallic • Reaction with acid: No• Magnetic: No• Streak: Greenish Black• Other: Strike with hammer creates hot
spark, smells like sulfur• Location: Very common in NS
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Pyrolusite (MnO2)Manganese OreHardness (6): Same as knife; brittle, Shape: grains, kidney-shaped radial massesColour: Steel greyLustre: Sub-MetallicReaction with acid: NoMagnetic: NoStreak: Reddish brownOther: Heavy (SG 5)Localities: New Ross, Noel shore
Pyrolusite,
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Pyrrhotite (Pee-rho-tite) (FeS)• Hardness: Scratch with knife; brittle, forms
powder when struck• Shape: Forms prisms, plates, also in masses• Colour: Bronze colour, surface tarnishes to
brown• Lustre: Metallic • Reaction with acid: No• Magnetic: Magnetic, powder sticks to
magnet • Streak: Grey Black• Other: Common in mainland NS in slates and
gold districts
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Quartz (SiO2)• Hardness: (7) Very hard, scratches
glass, brittle• Shape: 6-sided prism ending in 6-sided
pyramid, fine-grained to massive• Colour: Transparent, white, yellow, tan,
pink to purple (amethyst)• Lustre: Glassy to greasy • Reaction with acid: No• Magnetic: No• Streak: White• Other: Quartz veins with gold common
in NS gold depositsQuartz Vein, Dufferin Mine
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Salt (Halite) (NaCl) Sodium Chloride• Hardness (2.5): Scratched by fingernail
brittle, breaks in to small cubes• Shape: Massive, cubic crystals• Colour: Colourless, white, blue, pink• Lustre: Vitreous• Reaction with acid: No• Magnetic: No• Streak: White• Other: Road Salt, table salt; salty taste• Localities: Pugwash
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Scheelite Ca (WO4) Tungsten Ore• Hardness (4-5): Scratch with knife, brittle,
powder white• Shape: Usually platy form• Colour: White-pale yellow-browish yellow• Lustre: Glassy• Reaction with acid: No• Magnetic: No• Streak: white• Other: Fluoresces (shines) under black light
(UV lamp)• Localities: Common in quartz-gold veins
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Sphalerite: (ZnS) Zinc Ore• Hardness: Can be scratched by copper
coin, very brittle• Shape: Colour: brown, yellow, green,
reddish• Lustre: Resinous, greasy• Reaction with acid: No• Magnetic: No• Streak: Brownish white• Localities: Gays River, Hants County;
Jubilee, Cape Breton
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Stibnite: (Sb2S3) Antimony Ore• Hardness (2): Very soft: scratch with by
fingernail• Shape: Forms prisms, needles • Colour: Black-grey• Lustre: Metallic • Reaction with acid: Decomposed with acid• Magnetic: No• Streak: Blackish grey• Other: Toxic• Localities: West Gore
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Zeolites• Hardness (2): Very soft; can be scratched
with fingernail• Shape: Form needles, radial groups• Colour: White to pink• Lustre: Vitreous to pearly• Reaction with acid: No• Magnetic: No• Streak: White• Other: Heated on flame with tweezers
releases steamLocalities: North Mountain
• Stilbite is Nova Scotia’s Mineral
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Prospecting in Nova Scotia
Minerals of Nova Scotia