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+ward’ssciencewardsci.com800-962-2660 Quartz (variety Chalcedony) Si O2 Crystallography: Hexagonal -R; 32 (low-quartz). Hexagonal; 622 (high quartz). Cryptocrystalline; massive. Often, mammillary, botryoidal, or stalactitic. Physical Properties: C...

Care, Handling and Safety Data Sheet Information Fixing and Holding Solutions The preservation of all specimens involves the chemical alterations of the tissue proteins that inhibit bacterial and fungal growth that ultimately leads to decompositio...

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Develop a Chemical Purchasing Plan Developing a purchasing plan and rigorously following the plan when ordering the school’s chemical supply will help safety, prevent waste and save money. The following may help your school make chemical purchases...

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wardsci.com 800-962-2660 Opal SiO2 • nH2O Crystallography: None, amorphous. Massive, often in rounded and botryoidal forms, sometimes pisolitic. Physical Properties: Cleavage: None; conchoidal fracture. Hardness: 5.0-6.0. Specific Gravity: 2.0-2.2...