Maicom Quarz GmbH
Posterstein
Germany

QSIL GmbH Quarzschmelze Imenau
Ilmenau
Germany

Heraeus Quarzglas Bitterfeld GmbH & Co. KG
Bitterfeld-Wolfen
Germany

Stone Italiana S.p.a.
Zimella
Italy

HERAEUS CONAMIC, HERAEUS QUARZGLAS GMBH & CO. KG
Kleinostheim
Germany

HPF THE MINERAL ENGINEERS / QUARZWERKE GMBH
Frechen
Germany

FIORI DI CARMEN CRISTALLI DI QUARZO E SCALDESSENZE ARTI
Martignana Di Po
Italy

VOGELSBERGER QUARZGLASTECHNIK GMBH
Hauzenberg
Germany

HERAEUS QUARZGLAS GMBH&CO.KG HERAEUS CONAMIC
Hanau
Germany

QUARZ-TEC.DE
St Ingbert
Germany

WOLFF & MÜLLER QUARZWERKE GMBH
Röderland
Germany

DECKING QUARZ SRL
Campodarsego
Italy

AACHENER QUARZGLAS TECHNOLOGIE HEINRICH GMBH & CO.KG
Aachen
Germany

QUARZSANDWERK LANG GESMBH & CO KG
Gschwend
Germany

QUARZ-TEC.DE
St. Ingbert
Germany

HPF THE MINERAL ENGINEERS / QUARZWERKE GMBH
Frechen
Germany

QUARZ-TEC.DE
St. Ingbert
Germany

HERAEUS QUARZGLAS GMBH & CO. KG
Bitterfeld-Wolfen
Germany

AERA VATOR QUARZSANDWERK LANG
Gschwend
Germany

AACHENER QUARZGLAS TECHNOLOGIE HEINRICH
Aachen
Germany