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Single-Crystal Germanium Sphere - 25 to 100 mm Diameter

  • A small sample of pure germanium
2.00 LBS
8 weeks from receipt of payment
Free Shipping

Product Description

These are single-crystal germanium spheres machined from optical-grade germanium boules.  The CNC machining technique used assures that the polish is uniform around the sphere, not subject to the effects of the crystal orientation that may appear during surface polishing. 

We offer germanium spheres in these sizes;

Diameter (mm)   Mass (gm) 
25 15.7
37.5 53


75 106
100 251


Technical Specifications

  • Atomic Number: 32
  • Atomic Weight: 72.63 (nominal, nall isotopes in their natural ratios are present)
  • Scratch and dig: 60/40 (not normally visible to the naked eye)
  • Surface roughness: 2.5 nm RMS (as if the tallest mountain on earth was 4 feet high)

The picture shows a sample of germanium.  Germanium appears darker than silicon due to germanium's higher index of refraction.  Currently, we do not have a picture of a germanium sphere.

The Rules (No Exceptions)

All germanium sphere orders must be fully prepaid by bank wire.  We will provide the bank details at purchase.

Orders are non-cancellable for any reason; prepayments are non-refundable, silicon spheres are non-returnable.

Spheres are fabricated to order.  This takes about 8 weeks.  The clock starts when payment is received.

Purchasers may select a fired ceramic stand similar to that shown in the picture at no cost.

These spheres are sold without warranty.  They are single crystals, not metal balls.  If you drop them, they will shatter.

Custom Items

We can supply spheres of other diameters and physical characteristics on special order.  Please inquire if you are interested.



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