Question

In this assignment, you will identify some minerals. The ability to identify minerals is one of the most fundamental geological skills. It is an essential skill in identifying rocks, for one must first identify the minerals within a rock before the rock itself can be identified. Only after minerals and rocks have been identified can their origin, classification, and alteration be adequately understood. The ability for a geologist to identify minerals by using the simplest tools is often a necessity, particularly when working in the field.

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In your lab box, you should have the mineral samples. Identify them and then you can fill in the table on page 118 in your lab manual. Take a picture of page 118 and send it to me; that's all.

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Sample Color Luster Streak Crystal Form Mscellanegus Tests Hardness Speciho Gravity Mineral Name Cleavage fink Pert Whight|6=6.5| Trrclwic2 eleming 10 Fedsear Quartz A 2.S-2.7 Monoclnie Every B Hexyo None 2.6-2.7 color N.keouscalor Blach 2.5-3 Monocln Basat 2.7-3.1 BIotite Calerte PH |GYfsum Fluorrte brwni rey Rhombo asually whrte Nitreams white D Reach 3 Hex-agond Bdirectnd 2.7 F F Magnette G Halite H Homblende Muscovite Figure 5.9 Mineral Identincation Chart. 118 Sample Color Crystal Form Specific Gravity Miscellaneous Tests Mineral Name Streak Luster Hardness Cleavage Pink Peart Whrt-s Tse 2 clemiag Every Color NikeousColor Black Feldspar Quartz A dnd Monochnie e 2.S-2.8 7 Hexayona None 2.6-2.7 2.5-3 MonoclmrC BasaHt 2.7-3.4 grey Βτotte C brown Asually D Rhombo Hexngom-hedral rn directond 2.7 Reach wth whrte Nitreaus White Calcrte 3 PH GypsuM Fluorite Maignetrte E G Halte H Hormblende Muscovite Figure 5.9 Mineral Identification Chart. .. L7 118

Answer 1

Sample	color	lusture	streak	hardness	crystal form	cleavage	specific gravity	miscellaneous test	mineral name
1	pink , white ,grey	vitreous	white	6- 6.5	Triclinic or monoclinic	2 or 3	2.5-2.7		Feldspar
2	colorless, pink,	Vitreous	White	7	Trigonal or hexagonal	absent	2.65		Quartz
3	dark brown	vitreous to pearly	white	3	Monoclinic	1 set {001}	2.7- 3.3		Biotite
4	colorless, white	vitreous to pearly	white	3	Trigonal	3 set	2.71	with dilute HCl gives brisk effervescence	Calcite
5	white	vitreous to silky	white	2	Monoclinic	2 set {010}{100}	2.3		Gypsum
6	colorless but due to impurities may be colored	vitreous	white	4	isometric	2 set {111}{011}	3.2		Fluorite
7	black grey	metallic	black	5.5-6.5	Isometric	1 set {111}	5.2		Magnetite
8	white	vitreous	White	2-2.5	Isometric	{001}	2.17		Halite
9	black to dark green	vitreous to dull	greyish white	5.-6	Monoclinic	2 set at 56° and 124°	2.9		Hornblende
10	white ,grey	vitrwovi, pearly	white	2 and 4	Monoclinic	{001}	2.7-3		Muscovite