Geology 300: Physical Geology

Geology 301: Physical Geology Lab

Geology 305: Earth Science

Geology 306: Earth Science lab

Samples: Minerals, Sedimentary, Igneous, Metamorphic

Instructor: Arthur Reed, P.G.

Mineral Samples for Geol 301 Lab Activity 3.4

All samples are approximately 1” – 3” in size

SG = Specific Gravity

NOTE: ALWAYS CLICK ON THE SAMPLE NUMBER UNDER THE PHOTO TO GET THE BEST/CORRECT VIEW OF THE MINERAL

SAMPLE 553

Fizzes with HCl

Hardness: 3

SG = 2.7

SAMPLE 554

Hardness: 3.4 - 4

SG = 4.1 – 4.3

SAMPLE 556

May fizz with HCl when in powdered (scratched) form

Cleavage excellent (although not apparent in this photo)

Hardness: 3.5 - 4

SG = 2.8 – 2.9

SAMPLE 557

Hardness: 2.5

SG = 7.4 – 7.6

SAMPLE 558

Cleavage good (although not apparent in this photo)

Hardness: 2

SG = 2.3

SAMPLE 562

This mineral comes in all colors

Hardness: 7

SG = 2.6 – 2.7

SAMPLE 564

May feel greasy

Hardness: 1

SG = 2.7 – 2.8

SAMPLE 565

Often is cubic form

Taste Test: tastes salty

Hardness: 2.5

SG = 2.1 – 2.6

SAMPLE 567

May have slight attraction to a magnet

Hardness: 1 - 6

SG = 4.9 – 5.3

SAMPLE 568

Hardness: 4 - 7

SG = 3.6 – 3.7

SAMPLE 569

Hardness: 7 – 7.5

SG = 3.0 – 3.2

SAMPLE 571

Cleavage excellent (although not apparent in this photo)

Hardness: 2 – 2.5

SG = 2 - 3

SAMPLE 573

Hardness: 7

SG = 2.6 – 2.7

SAMPLE 574

Hardness: 2.5 - 3

SG = 2.7 – 3.1

SAMPLE 576

Cleavage good (although not apparent in this photo)

Hardness: 5.5 - 6

SG = 3 – 3.3

SAMPLE 580

Hardness: 9

SG = 3.9 – 4.1

SAMPLE 588

Cleavage 90° in two directions (although not apparent in this photo)

Hardness: 6

SG = 2.6 – 2.8

SAMPLE 589

Cleavage excellent in two direction at nearly 90° (although not apparent in this photo)

Hardness: 6

SG = 2.5 – 2.6

SAMPLE 607

May be magnetic

Hardness: 6 – 6.5

SG = 5 – 5.2

SAMPLE 608

Crystals are often in cubic form

Hardness: 6 – 6.5

SG = 4.9 – 5.2

SAMPLE 609

May feel greasy

Hardness: 1

SG = 2 – 2.3

SAMPLE 612

Crystal shape may also be cubic

Hardness: 4

SG = 3 – 3.3

SAMPLE 613

‘stinky’, often found around volcanic vents

Hardness: 1.5 – 2.5

SG = 2.1

SAMPLE 617

Often greenish color

Hardness: 7

SG = 3.3 – 3.4

SAMPLE 624

Rhombic dodecahedron

Hardness: 7

SG = 3.5 – 4.3

SAMPLE 634

Hardness: 2.5 - 3

SG = 8.8 – 9.0

SAMPLE 635

Fracture may be conchoidal

Hardness: 5

SG = 3.1 – 3.4

SAMPLE 636

May be weakly magnetic

Hardness: 5 – 5.5

SG = 3.3 – 4.3

SAMPLE 637

May be weakly attracted to a magnet

Hardness: 5.5 - 6

SG = 4.5 – 4.8

SAMPLE 638

Look closely at the shape of some of the mineral grains

Hardness: 5.5 - 6

SG = 3.1

SAMPLE 640

Note the shape of the mineral grains

Also commonly dark green

Hardness: 6 - 7

SG = 3.3 – 3.5

SAMPLE 641

Fizzes in HCl

Hardness: 3.5 - 4

SG = 3.6 - 4