Other minerals show 1-WAY CLEAVAGE (micas, breaks into thin sheets or flakes), 2-WAY CLEAVAGE (feldspars, pyroxenes, amphiboles), or even 3-WAY CLEAVAGE (calcite, dolomite). STREAK: Color of the mineral when it is powdered. The test is done by rubbing the mineral on a streak plate (Hardness = 6.5). Minerals softer than 6.5 leave a mark on the ... Dark grey streak. Note: All the minerals above have a metallic luster. Massive means lacking a defined form. Non-metallic minerals (listed in decreasing hardness) Review mineral formula to connect to family! H=Hardness; SG = specific gravity Mineral H SG Streak Color and/or Luster Form Cleavage/Fracture Diagnostic properties Corundum Al 2O 3 Each rock and mineral comes with a customized identification card or brochure (mineral kit), which includes a photo and fun facts such as color, hardness, luster, texture, content, uses, locales, and interesting features. Children can identify each mineral using the streak plates (mineral kit), hand magnifier, and identification information. Streak is the color of the powdered mineral, which is usually more useful for identification than the color of the whole mineral sample. Rubbing the mineral on a streak plate will produce a streak. A streak plate can be made from the unglazed back side of a white porcelain bathroom or kitchen tile. This is an assignment I give my students before they actually take their mineral identification test. In this activity the minerals have already gone through the individual characteristics tests such as luster, hardness, color, streak and other mineral properties. This assignment is to give studen... Activity 20: Testing the Hardness of Common Minerals Maine Geological Survey Student Sheet Purpose: To learn how to determine the hardness of a mineral, a useful skill in mineral identification. Materials: You will need one specimen of each of the following minerals: quartz, calcite, feldspar, unknown #1, and unknown #2.

Streak is a valuable property because its color is usually the same even when larger samples of many minerals show a variety of colors. Streak is often better for mineral identification than color. Streak of metallic minerals Streak is valuable for identification of many metallic minerals, including native metals (such as gold), oxides and sulfide. The streak of a mineral is the color of the powder produced when it is dragged across an un-weathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in mineral identification. Activity 20: Testing the Hardness of Common Minerals Maine Geological Survey Student Sheet Purpose: To learn how to determine the hardness of a mineral, a useful skill in mineral identification. Materials: You will need one specimen of each of the following minerals: quartz, calcite, feldspar, unknown #1, and unknown #2. The "streak test" is a method used to determine the color of a mineral in powdered form. The color of a mineral's powder is often a very important property for identifying the mineral. The streak test is done by scraping a specimen of the mineral across a piece of unglazed porcelain known as a " streak plate." One of the most important tools in the arsenal used for mineral identification is the streak plate. This aid to mineral identification is usually a piece of unglazed porcelain. The two colors most commonly used are black and white with white used for dark colored minerals, and black used for light colored minerals. o A mineral’s streak is the color of the powder left behind when the mineral is scraped across a surface. o Often times a geologist will use a tile of unglazed porcelain, called a streak plate, as a tool to identify minerals by their streaks. o Streak is a better clue to a mineral’s identity than surface color is.

Other minerals show 1-WAY CLEAVAGE (micas, breaks into thin sheets or flakes), 2-WAY CLEAVAGE (feldspars, pyroxenes, amphiboles), or even 3-WAY CLEAVAGE (calcite, dolomite). STREAK: Color of the mineral when it is powdered. The test is done by rubbing the mineral on a streak plate (Hardness = 6.5). Minerals softer than 6.5 leave a mark on the ...

Children used the nail to see if they could scratch the rock, and the streak plate to see if they could write with the rock. I also laid out a ruler and some string for them to take measurements. Then they recorded all their information on their sheet, turned them in and started the process again on a different rock! Lots of fun and lots of ... Mineral Identification Basics. PHYSICAL PROPERTIES STREAK. STREAK is defined as the color of the mineral in powder form. Streak is normally obtained by rubbing a mineral across a streak plate. This is a piece of unglazed porcelain. The streak plate has a hardness of around 7 and rough texture that allows the minerals to be abraded to a powder.

1. Observe if the mineral shows cleavage or fracture and record it in the data chart. 2. Test the hardness of the mineral and record it in the data chart. 3. Observe and record the color of the sample. 4. Test the streak of the mineral. Use the white plate for dark minerals and the dark plate for light colored minerals. Streak is the color when a rock is rubbed across an unglazed piece of porcelain. Streak is much more useful than color because a mineral always has the same streak, but it still has its limits because minerals harder than the streak plate will scratch the streak plate instead of producing powder. Luster streak plate metallic-dull red/black skin/steel grey kidney shaped masses, fibrous * - Useful property for diagnosis RF - Common rock-forming mineral This table should notbe memorised. Marks in the examinations will be awarded for description of the outcomes of tests on minerals and, on some occasions, identifi

Alkaline earth metal periodic table facts

Activity 5: Locating Minerals in Africa ... of both rocks and minerals and a streak plate. ... the Mineral and Rock Identification Collection on a sheet of paper and ... How can a streak plate help you identify a mineral? asked by Kassidy on January 26, 2015; Science. I have two questions. 1. Describe what would happen if you rubbed a mineral with a Mohrs hardness value of 7 against a mineral with a value of 5? 2. Which mineral identification test would be easy for a person to perform at home. asked by Josie on ...

Streak plate mineral identification sheet

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You can observe the streak by rubbing the mineral across a tile called a “streak plate.” Drag the mineral sample across the streak plate. What color is the streak? _____ (Note: In some cases the streak is colorless and cannot be seen.) Observe: Select the . Acid . test. Some minerals cause hydrochloric acid to bubble and fizz. Streak. The color of a powdered portion of a mineral is known as its streak. Generally, the streak color is different from the color observed in hand sample, and it can be much more diagnostic for identification purposes. Mineral powder may be easily obtained by rubbing a corner of the specimen against a white porcelain surface (or streak plate). White porcelain streak plates are great for testing minerals. Often, the color of the mineral's streak is a clue as to the identification of the mineral. The streak is the color of the mineral in powder form. To perform the test, rub the mineral on the plate and observe the color. Many minerals have a streak that is You can observe the streak by rubbing the mineral across a tile called a “streak plate.” Drag the mineral sample across the streak plate. What color is the streak? _____ (Note: In some cases the streak is colorless and cannot be seen.) Observe: Select the . Acid . test. Some minerals cause hydrochloric acid to bubble and fizz.