I have a question in Earth Science that I'm really stuck on ..In what way are the minerals Quartz and Galena similar?Please help!
You could buy a 32kHz tuning fork crystal, then scale it up. Have a lapidiary cut you a suitalbly shaped chunk of quartz, then deposit the electrodes using a vacuum evaporator. It won't be cheap! What do you want it for?
Do you mean: what is the highest and lowest frequencies you can get from a crystal oscillator? from wikipedia: Quartz timing crystals are manufactured for frequencies from a few tens of kilohertz to hundreds of megahertz. A quartz crystal provides both series and parallel resonance. The series resonance is a few kilohertz lower than the parallel one. Crystals below 30 MHz are generally operated at parallel resonance, which means that the crystal appears as an inductive reactance in operation. Any additional circuit capacitance will thus pull the frequency down. For a parallel resonance crystal to operate at its specified frequency, the electronic circuit has to provide a total parallel capacitance as specified by the crystal manufacturer. Crystals above 30 MHz (up to >200 MHz) are generally operated at series resonance where the impedance appears at its minimum and equal to the series resistance. For this reason the series resistance is specified (<100 Ω) instead of the parallel capacitance. For the upper frequencies, the crystals are operated at one of its overtones, presented as being a fundamental, 3rd, 5th, or even 7th overtone crystal. The oscillator electronic circuits usually provides additional LC circuits to select the wanted overtone of a crystal.
A quartz crystal operating at less than 100 Hz would be very large and probably not practical. Even a tuning fork would be large at those frequencies. There is a much easier way. Use a crystal that is some power of 2 higher in frequency than the signal you want and divide it down using a simple ripple counter. There are more complex solutions which would allow you to divide by any integer, but the ripple counter is simple and cheap. The 74HC020 is a 14 stage ripple counter that might work well for you.
