Mineral A14

Image credit: R. Weller, Cochise College.

Mineral A14 Resources and Instructions

Unless otherwise noted, images are by Scott Brande.

Media Observable Properties for Identification

Observe Samples

Images are provided for most samples with approximate size scale information. 

Bulk

Click image to enlarge in new browser tab

Image credit: Scott Brande

Fragments Magnified

Size Scales: Image width about 20 mm. Each square about 4 mm on a side. End of paperclip about 5 mm inside width.

Image credit: Scott Brande

Test Luster

Review property of luster

Watch the video demonstration below and observe the close-up images.

Alternative Observations - Your Choice

Record results on Data Form

Backup on Youtube - Use Incognito

A14 fragments in reflected light; paperclip about 5 mm inside width.

Image credit: Scott Brande

A14 fragments in transmitted light; paperclip about 5 mm inside width.

Image credit: Scott Brande

Test Hardness

Watch the video demonstration below and observe the close-up image for evidence of an indented scratch.

Review property of hardness

Alternative Observations - Your Choice

Record results on Data Form

Backup on Youtube - Use Incognito

Image credit: Scott Brande

Test Streak

Watch the video demonstration below and observe the close-up image for evidence of a colored powder.

Review property of streak

Alternative Observations - Your Choice

Record results on Data Form

A14

Image credit: Scott Brande

Backup on Youtube - Use Incognito

Test Magnetism

Review property of magnetism

Watch the video demonstration below.

Alternative Observations - Your Choice

Record results on Data Form

Backup on Youtube - Use Incognito

Test Acid Reaction

Review property of acid reaction

Watch the video demonstration below and study the image for evidence of a reaction.

Alternative Observations - Your Choice

Record results on Data Form

Backup on Youtube - Use Incognito

Image credit: Scott Brande

Test Electrical Conductance

Review property of electrical conductance

Watch the video demonstration below and observe the close-up image.

Alternative Observations - Your Choice

Record results on Data Form

Backup on Youtube - Use Incognito

Observe Other Properties

Limitations of Observations

For various reasons, student-grade mineral samples may not exhibit all properties listed in the Data Form, making mineral identification more challenging. 

Instructions for Studying Other Properties

Cleavage

Review properties of cleavage

Observe the close-up image. Is cleavage present?

Alternative Observations - Your Choice

If present, record results on Data Form under other properties

A14 Fragments broken from single crystal.

Small size of fragments prevents determination of cleavage for this mineral from these fragments.

Image credit: Scott Brande

Conchoidal Fracture

Review properties of conchoidal fracture

Observe the close-up image. Is conchoidal fracture present?

Alternative Observations - Your Choice

If present, record results on Data Form under other properties

After observation, proceed to Crystal Form.

A14 Fragments broken from single crystal. 

Is conchoidal fracture present? Examine pattern of light reflections from surfaces of broken fragments.

Image credit: Scott Brande

Crystal Form(s)

Review properties of crystal form

Observe the close-up image.

Alternative Observations - Your Choices

Record results on Data Form under other properties

A14 Fragments broken from single crystal.

Do these broken fragments display any shape similar to that illustrated? If not, record N/A (not applicable).

Image credit: Scott Brande