This large chunk of Citrine Druzy, 2-4 inches in diameter, is great for any mineral collection.
Citrine is a variety of quartz whose color ranges from a pale yellow to brown due to ferric impurities. Quartz itself is the second most abundant mineral in the Earth’s continental crust, after feldspar. Since antiquity, varieties of quartz have been the most commonly used minerals in the making of jewelry and hardstone carvings, especially in Europe and the Middle East.
Quartz is a defining constituent of granite and other felsic igneous rocks, and can thus be found all over the world. It is very common in sedimentary rocks such as sandstone and shale and is also present in variable amounts as an accessory mineral in most carbonate rocks.Not all varieties of quartz are naturally occurring. Some clear quartz crystals can be treated using heat or gamma-irradiation to induce color where it would not otherwise have occurred naturally. Susceptibility to such treatments depends on the location from which the quartz was mined. However, there are naturally occurring quartz crystals of extremely high purity, necessary for the crucibles and other equipment used for growing silicon wafers in the semiconductor industry, which are expensive and rare.
FOUND IN: BRAZIL, PRIMARILY
Quartz crystals have piezoelectric properties; they develop an electric potential upon the application of mechanical stress. An early use of this property of quartz crystals was in phonograph pickups. One of the most common piezoelectric uses of quartz today is as a crystal oscillator. The quartz clock is a familiar device using the mineral.
These goggles meet the American National Standards Institution (ANSI Z87.1) and Canadian Standards (CSA Z94.3) regulations.
These extra-large, powder-free, 5mil Nitrile Exam Gloves are designed and manufactured for superior comfort and protection.
These disposable surgical-style earloop face masks conform to the ASTM F1862 Level 1 clasification. Box of 50.
These ear plugs are made of self adjusting foam that provides a comfortable, low pressure fit and excellent sound filtration.
These large, powder-free, 5mil Nitrile Exam Gloves are designed and manufactured for superior comfort and protection.
These premium 5mil medical-grade Nitrile Exam Gloves are designed and manufactured for superior comfort and protection.
This microscope is so versatile you can even take it with you on a job site!
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
Discover how solar cells make electricity with this awesome kit!
Build your own windmill generator kit by recycling a plastic bottle!
This illuminated orbiter is great for demonstrations in the astronomy classroom!
The LCD Digital Microscope II is a professional biological microscope at an affordable price. Up to 1600X with digital zoom!
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