streak plate
Porcelain diagnostic tile
A streak plate is a piece of unglazed porite used to identify minerals by the color of the powder they leave when scraped across the surface.
The streak often differs from the mineral's visible color—hematite appears black or silver but leaves a reddish-brown streak.
In microbiology, streak plate refers to a technique for isolating bacterial colonies by spreading a sample across an agar plate in a pattern that progressively dilutes the organisms.
Translucent fired clay
- unglazedLacking vitreous coating
- mineralNaturally formed crystalline solid
- powderFine dry particles
- diagnosticTest to identify problems
scratch · sample · specimen · residue · trace · marking · rubbing · ceramic tile
Color's specific character
- pigmentColor-imparting material
- metallicResembling ore-based elements
- nonmetallicWithout metal characteristics
- colorlessDevoid of pigmentation
Skin allergen sensitivity assessment
- talcHydrated magnesium silicate
- gypsumHydrated calcium sulfate
- calciteCrystalline calcium carbonate
- fluoriteCalcium-based cubic mineral
apatite · quartz · topaz · corundum · diamond · fingernail · copper coin · knife blade
porcelain
Translucent fired clay
diagnostic · scratch · sample · specimen · residue · trace · marking · rubbing · ceramic tile · white tile
hue
Color's specific character
- pigmentColor-imparting material
- metallicResembling ore-based elements
- nonmetallicWithout metal characteristics
scratch test
Skin allergen sensitivity assessment
fluorite · apatite · quartz · topaz · corundum · diamond · fingernail · copper coin · knife blade · resistance
- microbiologybacteria, bacterium, microbe, microbes, microorganisms
- lab containersbeaker, test tube, flask, vial, petri dish
- mineralogycalcite, quartz, feldspar, mica, olivine
- bacterial coloniescolony, petri dish, circular, convex, raised
- geology toolsrock hammer, hand lens, thin section, loupe, field notebook
- gold testingacid test, touchstone, hallmark, scratch test, gold purity