# Measuring Quartz Crystals

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1 1.2-1 SCIENCE EXPERIMENTS ON FILE Revised Edition Measuring Quartz Crystals Gary L. Stringer Topic Interfacial angles of crystals Time 30 minutes! Safety Please click on the safety icon to view the safety precautions. Materials two quartz crystals (For best results, use crystals that are at least ins. long and significantly different in size.) masking tape ruler contact goniometer (If the science department in your school does not own one, your science teacher may be able to help you make one with a protractor and 6-in. clear ruler. See figure 3.) Procedure 1. Choose one of the quartz crystals for measurement. Count the number of sides, and record the number on the data table. Stick a small piece of masking tape on each face (side) of the crystal, and number each face (1, 2, 3,...). Measure the width of each face to the nearest millimeter (see figure 1). Are the faces the same width? Record this information on the data table. Figure 1 Figure 2 w w = width of crystal face i i = interfacial angle 2. Use the contact goniometer to measure each interfacial angle of the crystal (the angle between adjacent crystal faces; see figure 2). To do this, place the contact goniometer so that the straight edge of the ruler is against one face and the straight edge of the protractor portion is against the adjacent face (see figure 3).

2 SCIENCE EXPERIMENTS ON FILE Revised Edition Next, read and copy the center of the ruler portion of the contact goniometer. There will be two numbers, one above the other. The outside number is the interfacial angle. Measure each interfacial angle and record each on the data table. Figure read outside number quartz crystal D ATA TA BLE Crystal 1 Number of sides Crystal 2 Number of sides Side Width Interfacial angle Side Width Interfacial angle number of side number of side 1 Faces 1 Faces (1 and 2) (1 and 2) 2 Faces 2 Faces (2 and 3) (2 and 3) 3 Faces 3 Faces (3 and 4) (3 and 4) 4 Faces 4 Faces (4 and 5) (4 and 5) 5 Faces 5 Faces (5 and 6) (5 and 6) 6 Faces 6 Faces (6 and 1) (6 and 1) 3. Repeat the procedure with the other quartz crystal. 4. How many faces did crystal 1 have? Crystal 2? 5. How did the widths of the faces of crystal 1 compare with each other? How did the widths of the faces of crystal 2 compare with each other? How did the widths of crystal 1 s faces compare with the width of crystal 2 s faces?

3 1.2-3 SCIENCE EXPERIMENTS ON FILE Revised Edition 6. How did the interfacial angles of crystal 1 compare with each other? How did the interfacial angles of crystal 1 compare with the interfacial angles of crystal 2? 7. Based on your results, what conclusion can you draw about the relationship between the widths of crystal faces and interfacial angles? Based on your data, what tentative conclusion might you draw about interfacial angles? What s Going On Although the widths of the two crystals faces vary, the interfacial angles of crystals of the same mineral are essentially equal. This constancy is a basic mineralogical law and can be measured in other quartz crystals, as well as in the crystal forms of other minerals. Though their size may vary, all crystals of a specific mineral have the same characteristic shape. The atoms of molecules in crystals are arranged in a regular, repeating pattern, that is, outwardly manifested by the mineral crystal s plane faces and the angles between them. Interfacial angles in a crystal remain constant regardless of the size of the crystal s plane faces. Connections Amethyst and opal are much-valued quartz gems. Amethyst has colors ranging from orchid pink to regal purple. It was once thought that if you carried an amethyst gem with you, it would protect you from drunkenness. Opals display flashes of colored light. A specific type of opal named fire opal has flamelike colors that flash as the gem is rotated.

5 vi Safety SCIENCE EXPERIMENTS ON FILE REVISED EDITION Do not use reflected sunlight to illuminate your microscope. Do not touch metal conductors. Use only low-voltage and low-current materials. Be careful when using stepstools, chairs, and ladders. USING CHEMICALS Never taste or inhale chemicals. Label all bottles and apparatus containing chemicals. Read all labels carefully. Avoid chemical contact with skin and eyes (wear goggles, apron, and gloves). Do not touch chemical solutions. Wash hands before and after using solutions. Wipe up spills thoroughly. HEATING INSTRUCTIONS Use goggles, apron, and gloves when boiling liquids. Keep your face away from test tubes and beakers. Never leave heating apparatus unattended. Use safety tongs and heat-resistant mittens. Turn off hot plates, bunsen burners, and gas when you are done. Keep flammable substances away from heat. Have a fire extinguisher on hand. WORKING WITH MICROORGANISMS Assume that all microorganisms are infectious; handle them with care. Sterilize all equipment being used to handle microorganisms. GOING ON FIELD TRIPS Do not go on a field trip by yourself. Tell a responsible adult where you are going, and maintain that route. Know the area and its potential hazards, such as poisonous plants, deep water, and rapids. Dress for terrain and weather conditions (prepare for exposure to sun as well as to cold). Bring along a first-aid kit. Do not drink water or eat plants found in the wild. Use the buddy system; do not experiment outdoors alone. FINISHING UP Thoroughly clean your work area and glassware. Be careful not to return chemicals or contaminated reagents to the wrong containers. Don t dispose of materials in the sink unless instructed to do so. Wash your hands thoroughly. Clean up all residue, and containerize it for proper disposal. Dispose of all chemicals according to local, state, and federal laws. BE SAFETY-CONSCIOUS AT ALL TIMES

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