AllMineralsRock
Crocoite
Crocoite is a popular mineral composed of lead chromate. [1]
Crocoite: Quick Facts and Characteristics
Some quick facts for Crocoite:- Transparency: Crocoite can be translucent or transparent.
- Crystallography: In terms of crystallography, crocoite is monoclinic.
- Luster: In terms of luster, crocoite can be adamantine or vitreous (glassy).
- Streak: Crocoite streaks orange-red, orange-red yellow or yellow.
- Hardness: Crocoite's hardness ranges from 2.5 to 3 on the Moh's scale.
- Specific Gravity: Crocoite's specific gravity ranges from 5.9 to 6.1.
Crocoite: Background and Summary
Crocoite is a rare mineral that is known for its vibrant orange-red color. It is composed of lead chromate, and its chemical formula is PbCrO4. Crocoite is typically found in small, thin crystals that are prismatic in shape. The crystals often occur in clusters or in parallel growths, and they can be transparent to translucent in appearance. Crocoite has a high specific gravity, which means that it is heavier than most other minerals of the same size.One of the most distinctive features of crocoite is its bright color. The orange-red hue is caused by the presence of chromium in the mineral. Crocoite can be easily identified by its color, as well as its crystal habit and high specific gravity. It is also known for its high luster, which gives it a shiny appearance.
Crocoite is a relatively rare mineral, and it is not commonly used in industry or manufacturing. However, it is highly valued by mineral collectors and enthusiasts. The vibrant color and unique crystal habit make it a prized addition to any mineral collection. Some specimens of crocoite can be quite large and impressive, and they are often displayed in museums and other public institutions.
Crocoite: Table of Properties
| Attribute | Crocoite (src) |
|---|---|
| Transparency | transparent, translucent |
| Chemical Formula | PbCrO4 |
| Chemical Composition | lead chromate |
| Specific Gravity | 5.9, 6.1 |
| Hardness | 2.5, 3 |
| Streak | orange-red yellow, yellow, orange-red |
| Crystallography | monoclinic |
| Refractive Index | 2.29, 2.66 |
| Hydrous | No |
| Colors | common: red, orange sometimes: yellow |
| Category | chromate |
| Birefringence | δ = 0.370 |
| Fracture | 1: 1 |
Crocoite: FAQ
Q: Is crocoite toxic?A: Yes, crocoite contains lead and is toxic if ingested or inhaled. It should be handled with care and kept away from children and pets.
Q: Where is crocoite found?
A: Crocoite is primarily found in mines in Tasmania, Australia. It has also been found in other locations around the world, including Russia, Brazil, and the United States.
Q: Can crocoite be used in jewelry?
A: Crocoite is not typically used in jewelry due to its toxicity and relative rarity. However, some mineral collectors may choose to display small specimens in a jewelry setting.
Sources
- "Crocoite Mineral Data." Mindat.org. https://www.mindat.org/min-1144.html- "Crocoite." Geology.com. https://geology.com/minerals/crocoite.shtml
- Crocoite: https://en.wikipedia.org/wiki/Crocoite
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