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Gravegliaite: Mn++(SO3)·3(H2O)
Comments: Pale brownish prismatic crystals of gravegliaite on matrix. Location: Gambatesa Mine, Val Graveglia, Genova, Liguria, Italy. Scale: Picture Size 1 mm. © Thomas Witzke
Greifensteinite: Ca2Be4(Fe++,Mn)5(PO4)6(OH)4·6(H2O)
Comments: Tabular crystal of greifensteinite impaled on acicular tourmaline. Location: Greifenstein Rocks, Ehrenfriedersdorf, Erzgebirge, Saxony, Germany. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Griceite: LiF Villiaumite: NaF
Comments: White aggregates of griceite with pinkish villiaumite. Location: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mt Saint-Hilaire, Rouville Co., Québec, Canada. Scale: Picture size 3.5 mm. © Thomas Witzke / Abraxas-Verlag
Grimselite: K3Na(UO2)(CO3)3·(H2O)
Comments: Small yellow crystals of grimselite in matrix. Location: Gerstenegg/Sommerloch tunnel, Grimsel Region, Hasli Valley, Bern, Switzerland. Scale: Picture size 1 mm. © Thomas Witzke / Abraxas-Verlag
Grumiplucite: HgBi2S4
Comments: Gray crystals of grumiplucite on quartz. Location: Levigliani, Apuan Alps, Lucca Province, Tuscany, Italy. Scale: Picture size 1.2 mm. © Thomas Witzke / Abraxas-Verlag
Hagendorfite: NaCaMn(Fe++,Fe+++,Mg)2(PO4)3
Comments: Greenish-black massive hagendorfite. Location: Hagendorf South Pegmatite (Cornelia Mine; Hagendorf South Open Cut), Waidhaus, Vohenstrauß, Oberpfalz, Bavaria, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Halotrichite: Fe++Al2(SO4)4·22(H2O)
Comments: White, fibrous halotrichite on rock. Location: Willi Agatz Mine, Dresden, Saxony, Germany. Scale: Picture size 4.5 cm. © Thomas Witzke / Abraxas-Verlag
Hammarite: Pb2Cu2Bi4S9 (?)
Comments: Metallic, white to gray hammarite with native bismuth in fluorite and quartz. Location: Sadisdorf, Schmiedeberg, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag
Hauerite: MnS2 Rambergite: MnS
Comments: Small black octahedral crystals of hauerite with small brown crystals of rambergite. Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Picture size 0.8 mm. © Thomas Witzke / Abraxas-Verlag
Hechtsbergite: Bi2O(OH)(VO4)
Comments: Light brownish crystals of hechtsbergite in matrix. Location: Hechtsberg Quarry, Hausach, Kinzig Valley, Black Forest, Baden-Württemberg, Germany. Scale: Picture size 1.3 mm. © Thomas Witzke / Abraxas-Verlag