Mineralogical Hardness

Numerari from KnowledgeDoor---The scientific calculator with graphing, unit keypads, complex numbers, constants, advanced functions, user-defined keys, quick copy, and more!

Element

Click button to see citations

Aluminum

2.75

Antimony

3.0

Arsenic

3.5

Barium

1.25

Beryllium

5.5

Bismuth

2.25

Boron

9.3

Cadmium

2.0

Calcium

1.75

Carbon

diamond

10.0

graphite

0.5

Cerium

2.5

Cesium

0.2

Chromium

8.5

Cobalt

5.0

Copper

3.0

Gallium

1.5

Germanium

6.0

Gold

2.5

Hafnium

5.5

Indium

1.2

Iridium

6.5

Iron

4.0

Lanthanum

2.5

Lead

1.5

Lithium

0.6

Magnesium

2.5

Manganese

6.0

Mercury

1.5

Molybdenum

5.5

Nickel

4.0

Niobium

6.0

Osmium

7.0

Palladium

4.75

Platinum

3.50

Potassium

0.4

Rhenium

7.0

Rhodium

6.0

Rubidium

0.3

Ruthenium

6.5

Selenium

2.0

Silicon

6.5

Silver

2.5

Sodium

0.5

Strontium

1.5

Sulfur

2.0

Tantalum

6.5

Tellurium

2.25

Thallium

1.2

Thorium

3.0

Tin

1.5

Titanium

6.0

Tungsten

7.5

Uranium

β-uranium

6.0

Vanadium

7.0

Zinc

2.5

Zirconium

5.0

Reference (Click the next to a value above to see complete citation information for that entry)

Samsonov, G. V., editor. Handbook of the Physicochemical Properties of the Elements. New York: Plenum Publishing Corporation, 1968.

Heaven's Boulevard astronomical sky image for any location, date, and time.
Personalize with a picture and message. Great gift for birthdays, anniversaries, or any special event.