MarkeTech Calcium Carbonate, Calcite (CaCO 3 ) Optical Grade Crystal

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MarkeTech Calcium Carbonate, Calcite (CaCO₃) Optical Grade Crystal (discontinued **)
Categories:	Ceramic
Material Notes:	Optical grade crystal with no small inclusions, cleavage planes, clouds and mist, point defects or bubbles inside the crystal. A proprietary process is used for cutting, grinding and polishing quality optical surfaces, producing high quality finished components that enable polarizers to be used with very high peak power lasers. Typical products are: rhombohedral shapes, rectangles and rounds, shaped plates, wedges, and cubes. Birefingent. Low susceptibility to moisture. Transparent 350 nm to 2300 nm. Data provided by MarkeTech International. MarkeTech International is no longer in business.
Key Words:	CaCO3
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Physical Properties	Metric	English	Comments

Density	2.71 g/cc	0.0979 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Mohs	3.1	3.1

Thermal Properties	Metric	English	Comments
CTE, linear	5.68 µm/m-°C	3.16 µin/in-°F	ac
	24.39 µm/m-°C	13.55 µin/in-°F	aa

Optical Properties	Metric	English	Comments
Refractive Index	1.47744 @Wavelength 1497 nm	1.47744 @Wavelength 1497 nm	no
	1.5114 @Wavelength 312 nm	1.5114 @Wavelength 312 nm	ne
	1.63457 @Wavelength 1497 nm	1.63457 @Wavelength 1497 nm	no
	1.71425 @Wavelength 312 nm	1.71425 @Wavelength 312 nm	ne
Transmission, Visible	90 %	90 %	transparent; thickness not quantified

Descriptive Properties
CaCO₃ Content	99.94%
Crystal Structure	Crystalline Rhombohedral
Particle Shape	Crystalline Rhombohedral

**
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C5MT829 / 120738

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