Hydroxylherderite
Mineral CaBe(PO4)(OH)
Also called Herderite
About it
Glassy crystals from lithium pegmatites, usually sold as herderite though most specimens are this hydroxyl form. Fine crystals come from Minas Gerais in Brazil, Maine, and Pakistan.
- Type
- Mineral
- Group
- Phosphate, herderite group
- Formula
- CaBe(PO4)(OH)
- Hardness (Mohs)
- 5–5.5
- Specific gravity
- 2.95–3
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Monoclinic
- Colours
- colourless, white, pale yellow, pale green, pale purple
- Transparency
- transparent, translucent
- Cleavage and fracture
- poor; subconchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.