Hydroxylherderite
Hydroxylherderite was named in 1894 for its compositional relationship to herderite in honor of Siegmund August Wolfgang von Herder of Freiberg, Saxony, Germany. It is a calcium-beryllium phosphate that is the OH end-member of the herderite-hydroxylherdite series. Predominantly found in granite pegmatites as subhedral to euhedral crystal sections of varying size, and is not uncommon as well-formed crystals in miarolitic cavities in granite pegmatite as stout, prismatic [001], [100] or tabular [001], pseudo-orthorhombic or pseudohexagonal crystals, and botryoidal aggregates with a radial fibrous structure. Hydroxlherderite forms transparent, translucent, to nearly opaque, colorless, gray, brown, pale yellow, greenish white, light blue, or purple crystals with a vitreous to resinous luster. It is commonly twinned {001} or {100} as fishtail contact twins. Associated minerals include: topaz, microcline, quartz, albite, lepidolite, elbaite, muscovite, and beryllonite. Notable localities in the U.S. include: the Blue Chihuahua mine, Riverside Co.; the Himalaya and Green Cloud mines, San Diego Co., California; the Bennett Quarry, Waisanen Quarry, Dunton Gem and Newry mines, Oxford Co.; and Berry Quarry, Androscoggin Co., Maine. Exceptional crystals are found in Minas Gerais state, Brazil at the Xanda mine, Virgem da Lapa; Lavra do Enio, Galileia; and the Golconda mine, Governador Valadares. In recent years, good crystals have originated from the Skardu district, Baltistan, Northern Areas, Pakistan, as well as the Darra-i-Pech Pegmatite Field, Nangarhar, Province, and at Paprok, Nuristan Province, Afghanistan.
You can buy these rare crystals online from The Arkenstone, www.iRocks.com to add fine mineral specimens to your collection.
- T07-54
- Hydroxyl-Herderite
- Barra das Salinas, Coronel Murta, Minas Gerais, Brazil
- Small Cabinet
- 8.0 x 6.5 x 3.9 cm
- $1,500.00
- HERDER09-2
- Hydroxylherderite
- Virgem da Lapa, Minas Gerais, Brazil
- Cabinet
- 11.7 x 10.8 x 7.0 cm
- $1,800.00
- JB17-1898
- Herderite on Blue Topaz
- Xanda Mine, Virgem De Lapa, Minas Gerais, Brazil
- Small Cabinet
- 7.5 x 6.0 x 4.5 cm
- OB16A-59
- Hydroxylherderite on Schorl
- Shigar Valley, Skardu District, Gilgit-Baltistan, Pakistan
- Miniature
- 4.7 x 4.0 x 2.3 cm
- SOREG15-63
- Hydroxylherderite (1969 Pocket) With Tourmaline
- Xanda Mine 1969 find, Virgem da Lapa, Jequitinhonha valley, Minas Gerais, Brazil
- Miniature
- 3.8 x 1.4 x 0.7 cm
- OB14B17
- Hydroxylherderite
- Shigar Valley, Gilgit-Baltistan, Pakistan
- Miniature
- 3.7 x 3.2 x 3.0 cm
- MD-250308
- Topaz, Hydroxylherderite, Epidote
- Dache (Dassu; Dasu; Haramosh-Dassu; Dacha), Haramosh Mts., Gilgit District, Northern Areas, Pakistan
- Miniature
- 3.5 x 2.4 x 2.4 cm
- MD-37076
- Hydroxylherderite
- Bennett Quarry, Buckfield, Oxford Co., Maine, USA
- Toenail
- 3.1 x 2.8 x 2.4 cm
- MD-203270
- Hydroxylherderite, Quartz (Var: Smoky Quartz)
- Pack Rat Mine, Mt. Tule, Jacumba District, San Diego Co., California, USA
- Small Cabinet
- 5.3 x 3.5 x 3.4 cm
- MD-30058
- Hydroxylherderite, Albite (Var: Cleavelandite), Muscovite
- San Diego Co., California, USA
- Thumbnail
- 2.3 x 1.5 x 1.1 cm
- MD-51266
- Hydroxylherderite, Schorl, Albite
- Shigar Valley, Skardu District, Baltistan, Northern Areas, Pakistan
- Thumbnail
- 2.0 x 2.0 x 1.0 cm
- MD-130914
- Hydroxylherderite
- Apo Ali Gun (Apaligun; Apaligon), Braldu Valley, Skardu District, Baltistan, Northern Areas, Pakistan
- Thumbnail
- 1.9 x 1.3 x 0.9 cm
- MD-19050
- Hydroxylherderite
- Bulochi (Balochi; Balche; Bulache; Bulachi; Drot Balachi), Astor valley (Astore valley), Astor District (Astore District), Northern Areas, Pakistan
- Miniature
- 4.5 x 4.0 x 2.8 cm
- MD-273127
- Hydroxylherderite, Schorl
- Erongo Mountain, Usakos and Omaruru Districts, Erongo Region, Namibia
- Small Cabinet
- 5.5 x 3.9 x 3.5 cm
- MD-243483
- Hydroxylherderite, Feldspar Group
- Virgem da Lapa, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
- Cabinet
- 9.7 x 7.2 x 3.1 cm
- MD-243480
- Hydroxylherderite, Feldspar Group
- Virgem da Lapa, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
- Large Cabinet
- 23.4 x 12.5 x 5.0 cm
- MD-243401
- Hydroxylherderite, Tourmaline (Var: Indicolite)
- Virgem da Lapa, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
- Miniature
- 4.1 x 1.8 x 1.5 cm
- MD-112783
- Hydroxylherderite
- Virgem da Lapa, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
- Miniature
- 4.0 x 3.0 x 3.0 cm
- MD-22011
- Hydroxylherderite
- Virgem da Lapa, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
- Miniature
- 4.2 x 3.7 x 2.7 cm
- MD-256784
- Hydroxylherderite, Muscovite
- Barra de Salinas district, Barra de Salinas, Coronel Murta, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil
- Miniature
- 3.4 x 2.2 x 1.7 cm
- MD-139748
- Hydroxylherderite
- Aracuai (Arassuai), Jequitinhonha Valley, Minas Gerais, Brazil
- Miniature
- 3.4 x 3.3 x 2.0 cm
- MD-159543
- Hydroxylherderite
- Golconda pegmatite, Governador Valadares, Doce valley, Minas Gerais, Southeast Region, Brazil
- Small Cabinet
- 5.4 x 4.2 x 2.9 cm
- MD-112486
- Hydroxylherderite
- Jove Lauriano claim (Joveni claim; Joventino claim), Linopolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Brazil
- Small Cabinet
- 6.0 x 4.6 x 1.2 cm
- MD-23843
- Hydroxylherderite, Albite
- Sao Francisco do Sul, Santa Catarina, South Region, Brazil
- Thumbnail
- 6.2 x 5.3 x 4.5 cm