Page 31 - Petrophysics 2E

6 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

TABLE 1.4
(CONTINUED)

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Graphite-C: carbon; gray to black; metallic luster; H = 2.
Gypsum-Cas04 .2H20: hydrous calcium sulfate; transparent to white or gray;
vitreous-pearly-silky; H = 2.
Halite-NaC1: sodium chloride; colorless to white; vitreous-pearly; H = 2.
Hematite-FezO3: iron oxide (the most important iron ore); reddish-brown to
black or gray, H = 6.
Hornblende (Amphibole group)-Ca2Na(Fe2, Mg)4(Al, Fe3, TiXAl, Si)s(O, 0H)z:
hydrous alkali, ferro-magnesium, aluminum silicates; dark green to black;
exhibits cleavage. The iron and magnesium impart the dark color. H = 5.
Illite (Muscovite)-KAt2(AlSi3 0 10)(OH)2 : hydrous potassium-aluminum silicate;
clear to light green, vitreous; not chemically well-defined but with the
approximate composition of muscovite; H = 2.5.
Kaolinite (Clay)-&(Si4010)(0H)4 : hydrous aluminum silicate; light colored;
H = 1-2.
Limonite (Goethite)-FeO(0H) . H20: hydrous iron oxide; yellow-brown to dark
brown; H = 5.
Magnetite-FejO4: iron oxide; black metallic luster; strongly magnetic iron ore;
H = 6.
Montmorillonite (Smectite clay)-(CaNa)(Al, Fe, Mg)&i, Al)s(OH)s; generally
light colored; H = 1.
Muscovite (Mica)-KAl~(AlSi30 lo)(OH)2 : hydrous potassium-aluminum silicate;
clear to light green; vitreous; rock-forming mineral; H = 2.5.
Olivine-@e, Mg)2Si04: ferro-magnesium silicate; clear to light green, various
shades of green to yellow; vitreous (glassy) luster with crystals in the rock;
H = 7.
Opal-Si02 . nH20: hydrous silicon dioxide; variety of almost any color; glassy
luster; H = 5.
Pyrite-FeS2: iron sulfide; pale yellow; bright metallic luster; H = 6.
Quartz-SiO2: silicon dioxide; clear (transparent) or with a variety of colors
imparted by impurities (purple amethyst, yellow citrine, pink rose quartz,
brown smoky quartz, snow white chert, multiple colored agate); glassy luster;
H = 7.
Serpentine--Mg$3205(0€€)4: hydrous magnesium silicate; beige color; H = 3.
Siderite-FeCOj: ferrous carbonate; light colored to brown; H = 3-4.
Sphalerite-ZnS: zinc sulfide; yellow to dark brown or black; resinous luster;
exhibits cleavage; zinc ore; H = 3.
Sulfur-S: yellow; resinous; H = 1-2.
Sylvite-KC1: potassium chloride; colorless to white; H = 1-2.
Talc-Mg3(Si4010)(OH)2: hydrous magnesium silicate; green, gray, or white;
soapy to touch; H = 1.
Topaz-A12(Si04)(Fe,OH)z: yellow, pink, blue-green; exhibits cleavage; H = 8.
Turquoise-C~(PO4)4(OH)s e2H20: blue or green color; H = 5.
Vermiculite--Mg3Si4010(OH)2nH20: hydrous magnesium silicate; light
colored; H = 1.