Calcite Calcium Carbonate
CaCO3

Crystal properties

 

Crystal Type

trigonal

Transmission Range

0.25 ... 2.3 µm

Refractive Index

no=1,6654 / ne=1,4898 @ 509 nm

Density

2.711 g/cm3 @ 25 °C

Melting Point

894 °C (decomposes)

Molecular Weight

101.9613

Thermal Expansion

13 × 10–6 / K

Hardness (Knoop)

3 Mohs

Young’s Modulus

69.9 GPa

Shear Modulus

35 GPa

Bulk Modulus

98 GPa

Solubility in Water

none

Crystal Structure

Single crystal, synthetic

Application

polarisers

List of Optical Crystals

Materials

Refractive Index

Transmission
Range (mm)

Density
(g/cm³)

Thermal Expansion  
Coefficient (10-6/K) 

BK7 glass

1.5164 (588 nm)

0.330 – 2.1

2.51

7.5 

SF11 glass

1.78472 (588 nm)

0.370 – 2.5

4.74

6.8 

F2 glass

1.62004 (588 nm)

0.420 – 2.0

3.61

8.2 

Fused Silica

1.4858 (308 nm)

0.185 – 2.5

2.20

0.55 

CaF2

1.399  (5.0 mm)

 0.170 – 7.8

 3.18

 18.85 

BaF2

 1.460 (3.0 um)

 0.15 – 12.0

 4.88

 18.4 

Sapphire

1.755 (1.0mm)

0.180 – 4.5

3.98

8.4 

Silicon

3.4179 (10mm)

 1.200 – 7.0

 2.33

 4.15 

Ge

4.003 (10 mm)

 1.900 – 16

 5.33

 6.1 

ZnSe

2.40  (10 mm)

0.630 – 18

5.27

7.8 

ZnS

2.2 (10mm)

0.380 –14

4.09

6.5 

LiF

1.39 (500 nm)

 0.150 – 5.2

 2.64

37 

KBr

1.526 (10 mm)

 0.280 – 22

 2.75

43 

 MgF2

no =  1.3836
ne = 1.3957 (405 nm)

0.130 – 7.0

7.37

a: 13.7
b: 8.48

YVO4

no = 1.9500
ne = 2.1554 (1.3 mm)

0.400 – 5.0

4.22

a: 4.46
b: 11.37

Calcite

no =  1.6557
ne = 1.4852 (633 nm)

0.210 – 2.3

2.75

a: 24.39
b: 5.68

Quartz

no =  1.5427
ne = 1.5518 (633 nm)

0.200 – 2.3

2.65

7.07

α-BBO

no =  1.6749
n= 1.5555 (532 nm)

0.190 – 3.5

3.85

a: 4.0
c: 36

LiNbO3

no =  2.2863
ne = 2.2027 (633 nm)

0.370 – 4.5

4.64

a: 16.7
c: 2.0