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 |
| Colemanite | CaB3O4(OH)3·H2O
Ca2B6O11·5H2O | C22 | insulator
3×1010 | 14<e<7,000 | ferroelectric
Goldsmith (1956) | -7 | | moderate birefringence | OT | Paraelectric, space group C2h5at normal temperatures. |
| Dufrénoysite | 2PbS·As2S3 | C22 | | | ferroelectric ?
(isostructural) | | | very weak pleochroism, distinct anisotropy, very weak bireflectance. | 36.1 to 39.4 | |
Liveingite
(rathite II) | Pb9As13S20 | C22 | | | ferroelectric ?
(isostructural) | | | weak bireflectance, distinct anisotropy. | 34.0 to 36.0 | |
| Wakabayashilite | (As10·2Sb)S18
As11S18 | C22 | | | pyroelectric
ferroelectric ?? | | | strongly anisotropic, very bright internal reflections. | ||a ~26?
||b ~18? | Ramdohr (1980) says orthorhombic crystal class if As11S18. |
| Paradocrasite | Sb2(Sb,As)2 | C23 | metal | | pyroelectric | | | | 70 ? | |
| Polybasite | Ag16Sb2S11 | C2? | | | pyroelectric
Parkhomenko (1971) | | | distinct pleochroism in oil, strongly anisotropic, abundant internal reflections, weak to distinct bireflectance. | R1-32.6
R2-30.7 | |
| Sylvanite | AuAgTe4 | C2h4 | metal ?
4×10-6 to 2×10-5 | | ferroelectric ?? | | | very distinct pleochroism, very strong anisotropy, common twinning, distinct bireflectance. | R1-50.3
R2-59.0 | Most common gold telluride. |
| Wolframite | (Fe,Mn)WO4 | C2h4 | semiconductor
10 to 105 | | ferroelectric ?? | | | weak pleochroism, weak to distinct anisotropy, weak to distinct bireflectance, moderate birefringence. | R1-15.0
R2-16.2 | |
Acanthite
(argentite) | Ag2S | C2h5 | semiconductor
n-type
1.5×10-3 to 1.5 | >81 | ferroelectric ?
(isostructural) | 179° | diamagnetic
k = -30 | very weak pleochroism, distinctly anisotropic, weak bireflectance. | R1-30.3
R2-31.3 | Converts to argentite, cubic, space group Oh9, at 179° and resistivity drops three orders of magnitude. |
| Arsenopyrite | FeAsS
As2S3 | C2h5 | semiconductor
mixed type
10-5 to 20 | 7 to >81 | ferroelectric ?
(isostructural) | <500 | diamagnetic or paramagnetic
k = 240 | weak pleochroism, strongly anisotropic, weak bireflectance. | Ra-52.2
Rb-51.7
Rc-52.0 | Forms solid solution with pyrrhotite. Isostructural with Pb3(VO4)2 and Pb3(AsO4)2. |
| Azurite | Cu3(OH)2(CO3)2 | C2h5 | semiconductor
5.6×108 | 6<e<21 | ferroelectric ?
(isostructural) | | | internal reflections so strong they mask strong anisotropy, strong bireflectance, extreme birefringence. | OT
~8 | |
| Baddeleyite | ZrO2 | C2h5 | | 12.4 | ferroelectric ?
(isostructural) | | diamagnetic
k = -14 | weak anisotropy, weak to moderate birefringence. | 13 to 14 | |
| Baumhauerite | Pb3As4S9 | C2h5 | | | ferroelectric ?
(isostructural) | | | distinct pleochroism, strong anisotropy, abundant twin lamellae, distinct bireflectance. | 35.8 to 40.2 | |
| Boulangerite | Pb5Sb4S11 | C2h5 | semiconductor
2×103 to 4×105 | | ferroelectric ?
(isostructural) | | | weak pleochroism, strong anisotropy, distinct bireflectance. | R1-38.3
R2-43.5 | Forms solid solution with falkmanite. |
| Chalcocite | Cu2S | C2h5 | semiconductor
p-type
10-4 to 2.3×103 | >81 | ferroelectric
Bieniulis (1985),
Bieniulis et al. (1984, 1987) | 105 to 130 | diamagnetic | very weak pleochroism, weakly to distinctly anisotropic, very weak bireflectance. | Ra-33.5
Rb-33.2 | Various dimorphic and non-stoichiometric forms. Optical properties vary greatly with composition. Measurable surface charges on crystal faces at 25C. Pseudo-orthorhombic. |
| Diaphorite | Pb4Ag6Sb6S16 | C2h5 | | | ferroelectric
(isostructural) | | | distinct bireflectance, strong anisotropy, no internal reflections. | 37.2 to 40.6 | |
| Freieslebenite | PbAgSbS3 | C2h5 | | | ferroelectric
(isostructural) | | | very weak pleochroism, distinct anisotropy but lower than in similar minerals, weak bireflectance. | R1-39.5
R2-35.6 | |
| Gudmundite | FeSbS | C2h5 | | | ferroelectric
(isostructural) | | | very distinct pleochroism, strongly anisotropic, distinct bireflectance. | 50.1 to 55.2 | |
| Hessite | Ag2Te | C2h5 | semiconductor
10-6 to 10-4 | | ferroelectric ?
(isostructural) | | | distinct pleochroism in oil, strong anisotropy, weak bireflectance. | 37.5 | |
| Jamesonite | Pb4FeSb6S14 | C2h5 | semiconductor
10-2 to 0.1 | | ferroelectric ?
(isostructural) | | | very distinct pleochroism intense anisotropy, twinning ||(100) characteristic, strong bireflectance. | R1-37.4
R2-42.9 | |
| Livingstonite | HgSb4S7 | C2h5 | | | ferroelectric ?
(isostructural) | | | fair pleochroism, very strong anisotropy, abundant internal reflections, distinct bireflectance. | 30.3 to 39.5 | Crystal system is controversial. May be triclinic? |
| Lorandite | TlAsS2 | C2h5 | | | ferroelectric ?
(isostructural) | | | weak pleochroism, strong anisotropy may be masked by internal reflections, weak bireflectance. | 26.9 to 29.5 | |
| Malachite | Cu2(OH)2CO3 | C2h5 | insulator
109 | 4<e<6 | ferroelectric ?
(isostructural) | | | abundant internal reflections mask strong anisotropy, strong bireflectance, extreme birefringence. | OT
~8 | |
| Manganite | MnO(OH) | C2h5 | semiconductor
10-2 to 0.5 | | ferroelectric ?
(isostructural) | | | weak pleochroism, ||(001), distinct pleochroism ||(010) and (100), quite vivid anisotropy, striking internal reflections ||(010) plane, weak to distinct bireflectance, moderate birefringence. | R1-14.8
R2-20.7 | |
| Marrite | PbAgAsS3 | C2h5 | | | ferroelectric ?
(isostructural) | | | distinct anisotropy, common internal reflections. | 31.5 to 34.0 | |
| Nitrokalite | Ca(H2O)(NO3)2 | C2h5 | | | ferroelectric
Parkhomenko (1971) | | | no data | | |
| Orpiment | As2S3 | C2h5 | | | ferroelectric ?
(isostructural) | | diamagnetic
k = -70 | very strong pleochroism, internal reflections mask very strong anisotropy, strong bireflectance, extreme bireflectance. | R1-27.5
R2-23.0 | |
| Quenselite | 2PbO·Mn2O3 | C2h5 | | | ferroelectric ?
(isostructural) | | | moderate pleochroism, strong anisotropy, common internal reflections, distinct bireflectance. | 20.7 to 23.2 | |
| Realgar | AsS | C2h5 | | | ferroelectric ?
(isostructural) | | | strong anisotropy, very abundant internal reflections, weak to distinct bireflectance, extreme birefringence. | R1-22.1 | |
| Rathite | (Pb,Tl)3As5S10 | C2h5 | | | ferroelectric ?
(isostructural) | | | strong pleochroism, extreme anisotropy, distinct bireflectance. | R1-41.4
R2-35.0 | |
| Samsonite | Ag4MnSb2S6 | C2h5 | | | ferroelectric ?
(isostructural) | | | weak pleochroism, weak anisotropy, distinct bireflectance. | 29.8 to 30.8 | |
Sartorite
(scleroclase) | PbAs2S4 | C2h5 | | | ferroelectric ?
(isostructural) | | | strong anisotropy, widespread twinning. | R1-36.9
R2-33.6 | |
| Sulfur | S | C2h5 | insulator
105 to 1016
mean 1012 | 3.8 | ferroelectric ?
(isostructural) | <119 | diamagnetic
k = -15 | distinct pleochroism, distinct anisotropy masked by omnipresent internal reflections, distinct bireflectance, extreme birefringence. | ||a 10.5
||b 11.7
||c 14.7 | No elements are presently known to form ferroelectric crystals. |
| Miagyrite | AgSbS2 | C2h6 | | | ferroelectric ?? | | | distinct pleochroism, strong anisotropy, distinct bireflectance. | R1-34.5
R2-31.6 | |
| Tenorite | CuO | C2h6 | semiconductor | 18.1 | ferroelectric ?? | | antiferromagnetic
k = 250
Tn = -43°C | moderate to strong pleochroism, distinct to strong anisotropy, distinct bireflectance. | R1-21.1
R2-25.7 | |
Titanite
(sphene) | CaTi(O/SiO4) | C2h6 | insulator
1.7×1011 | 21 | ferroelectric ?? | | | extreme birefringence, pleochroic in reflected light. | OT to ~10 | |
