Minerals are arranged alphabetically by space group (Schoenflies symbol).
| Mineral Name | Composition | Space Group | Resistivity (ohm-m) | Dielectric Permittivity | Charge Separation Phenomena | Curie Temp. °C | Magnetic Properties k×10-6cgs | Optical Properties | R % | Comments |
| Zinkenite (keeleyite) | Pb6Sb14S27PbSb2S4 | C66 | | | pyroelectric | | | weak to distinct pleochroism, distinct anisotropy, weak bireflectance. | Ro-33.7
Re-42.4 | Also falls in space group C6h2. |
| Berndtite | SnS2 | C6v4 | | | pyroelectric | <680 | | weak bireflectance, slight anisotropy. | ~25 | Also given as trigonal, space group C3v1. |
| Greenockite | CdS | C6v4 | semiconductor | 9 | pyroelectric | | diamagnetic
k = -50 | moderate birefringence | 19.4 | Forms solid solution with wurtzite and hawleyite. |
| Wurtzite | ZnS | C6v4 | semiconductor 3.5×102 | 8 | pyroelectric | | diamagnetic
k = -25 | moderate birefringence | 16.5 | Dimorphic with sphalerite and matraite. |
| Zincite | ZnO | C6v4 | semiconductor | 12 | pyroelectric | | | anisotropy masked by internal reflections, moderate birefringence. | 11.8 | |
| Troilite | FeS | D3h4 | p-type metal
10-6 to 10-1 | >81 | ferroelectric van den Berg et al. (1969) | 127 | antiferromagnetic
k = 5,187
Tn = 320-340°C | very distinct pleochroism, very strong anisotropy, very distinct bireflectance. | 37.5 | End member of solid solution with pyrrhotite. Uniaxial ferroelectric. |
| Achavalite | FeSe | D6h4 | | | ferroelectric ? (isostructural) | | | no data | | |
| Blaubleibender covellite | Cu1+xS | D6h4 | metal
10-7 to 10-3 | | ferroelectric ? (isostructural) | <157 | | remains blue, strong anisotropy. | Ro-8.2
Re-16.4 | |
| Covellite | CuS | D6h4 | p-type metal
10-7 to 10-3 | | ferroelectric ? (isostructural) | <500 | diamagnetic
k = -2 | extreme pleochroism, extremely anisotropic, very strong bireflectance | Ro-6.4
Re-23.7 | Forms solid solution with chalcocite and hawleyite. |
| Freboldite | CoSe | D6h4 | | | ferroelectric ? (isostructural) | | | strong anisotropy, very weak bireflectance. | ~48 | |
| Graphite | C | D6h4 | semimetal
10-8 to 103 | >81 | ferroelectric ? (isostructural) | | diamagnetic
k = -13 | extreme pleochroism, extremely anisotropic, extreme bireflectance. | Ro-17.4
Re-6.8 | Dimorphic with diamond and chaoite. No elements are presently known to form ferroelectric crystals. |
| Idaite | Cu5FeS6 | D6h4 | | | ferroelectric ? (isostructural) | | | very high pleochroism, enormous anisotropy, very strong bireflectance. | 26.9 to 29.8 | |
| Imgreite | NiTe | D6h4 | | | ferroelectric ? (isostructural) | | | no data | | |
| Jaipurite | CoS | D6h4 | | | ferroelectric ? (isostructural) | | | no data | | |
| Klockmannite | CuSe | D6h4 | | | ferroelectric ? (isostructural) | | diamagnetic
k = -20 | extreme pleochroism, extreme anisotropy, very strong bireflectance. | 15.6 to 37.2 | |
| Kotulskite | PdTe | D6h4 | | | ferroelectric ? (isostructural) | | | distinct bireflectance, strongly anisotropic. | 63.7 | Forms solid solution with merenskyite and moncheite. |
| Millerite (high) | NiS | D6h4 | semiconductor
T<Tn
metal
T>Tn
4×10-7 to 2 | | ferroelectric ? (isostructural) | <379 | antiferromagnetic
k = 1045
Tn = -10°C | distinct pleochroism, strongly anisotropic, distinct bireflectance in oil. | Ro-49.4
Re-56.6 | |
| Molybdenite | MoS2 | D6h4 | semiconductor
mixed type
10-36 | >81 | ferroelectric ? (isostructural) | <1675 | diamagnetic
k = -63 to -77 | extreme bireflectance, very high pleochroism, very strong anisotropy. | Ro-38.6
Re-19.5 | Measurable surface charge on crystal faces at 25C. May also be trigonal, space group C3v5. |
| Niccolite | NiAs | D6h4 | metal
10-7 to 10-5 | | ferroelectric ? (isostructural) | | | high pleochroism, very strong anisotropy, strong bireflectance. | 47.2 to 51.6 | |
| Nigglite | PtTe + PtSn ? | D6h4 | | | ferroelectric ? (isostructural) | | | very high bireflectance, extreme anisotropy | 45.4 to 57.8 | |
| Pyrrhotite | Fe1-xS (x<0.04) Fe7S8 (x>0.04) | D6h4 | p-type metal
10-6 to 10-1 | >81 | ferroelectricvan den Berg et al. (1969), van den Berg (1970, 1972) | >100 for x<0.04 | Fe7S8 is ferrimagnetic at room temperature
Tc=300 to 325°C
k=102 to 5×105
mean 1.25×105 | very distinct pleochroism, very strong anisotropy, very distinct bireflectance. | Ro-34.0
Re-40.7 | Forms solid solution with albandite, jaipurite, millerite, niningerite, and pyrite. Troilite is antiferromagnetic with k = 5,187, Tn=320 to 340°C |
| Tungstenite | WS2 | D6h4 | | | ferroelectric ? (isostructural) | |
k = 5,850 | extreme bireflectance, very high pleochroism, very strong anisotropy. | 18.1 to 35.7 | Optically difficult to distinguish from molybdenite. |
| Water Hexagonal iceCubic ice | H2O | D6h4 | mean 4.7×105 | >80 | ferroelectric Dengel et al. (1964), Cubotti and Geracitano (1967) | -80 to 173 | | | OT | |
