Name: from Latin helvus, meaning yellow.
Synonym: Helvine; hinsdalite; Orpheite; hydrokenoelsmoreite: alumotungstite, ferritungstite; hisingerite: sturtite.
Clades: Helvines;
Silicates.
Chemical: Be3Mn2+4(SiO4)3S.
Colour: golden yellow, brown, red, gray-yellow, yellow-green.
Lustre: vitreous, resinous.
Hardness: 6 - 6½.
Specific gravity: 3.2 - 3.44.
Crystal system: Isometric.